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jeever 13/04/2023
We have a very mixed feeling about this device. It looks very nice, is affordable and, because of these features, is undoubtedly a nice little gadget that a lot of hobbyists will fall for. But...a technical evaluation does not take into account such external features, but must answer the question of whether the DSO-TC3 is a good usable measuring device. As for the function generator and oscilloscope functions, we are quite positive. Both functions work, within the limitations of such a simple and inexpensive device, excellently. As for the measurement functions, we have to be less positive. Both small capacitors and inductances are measured with large errors. The measured ESR values of electrolytics and series resistances of coils are also a joke. About measuring a DC voltage with a resolution of up to 1 mV with a meter with an internal resistance of 160 kΩ, we are clearly: nonsense!
FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Function Signal Generator 3 in 1 Multifunction Electronic Component Tester
US$65.99 US$69.99
20
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Comments (3)
jeever 26/11/2023
Easy to solder amd build LED Christmas tree As we are used to from such deliveries from China, the components are squeezed together in a far too small plastic bag. Fortunately, there are no fragile parts inside! No manual is included, but several building descriptions can be found on the internet. There is nothing to criticise about the quality of the components supplied, which is good. However, in some kits, all the LEDs supplied are transparent and then you cannot see what colour they emit. The Christmas tree consists of two identical circuits, built on two almost identical PCB. Once these PCBs are fully soldered, you need to slide them together and mount them on the lower PCB. Even such a cheap kit comes with double-sided, metallised PCBs. The standard schematic of an astable multivibrator with two transistors has been extended with an extra stage. Basically, three RC networks C1/R3, C2/R5 and C3/R1 control the base of the transistors. Such a capacitor puts a negative voltage on the base at some point in the cycle. That negative voltage flows through the resistor to the positive power supply. The moment the voltage at the base rises to about +0.65 V, the relevant transistor starts to conduct. The collector voltage goes to zero, the LEDs in the collector light up. The negative voltage jump on the collector creates the negative voltage on the base of the next transistor. In this way, the system maintains itself and the three transistors Q1, Q2 and Q3 take turns to conduct.
DIY Christmas Tree LED Flashing Light Kit Circuit Board Mould Green Xmas
US$8.43 US$8.99
0
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jeever 26/06/2023
I have mixed feelings about this multimeter. The device looks modern and will no doubt appeal to a youthful audience, raised with the smartphone stuck in the hand. That what the meter can measure it mostly measures accurately, as evidenced by the various tables in my test. However, that the Aneng-683 is unable to measure small voltages or currents is such a major drawback that I cannot recommend this meter. About the display nothing but good, large, well lit and thus easy to read. I assume that the dramatically low input resistance of less than 1 MΩ is a result of the automatic switching, the so praised smartness of this meter. If that is indeed the case, I find this 'smart' feature to be a disadvantage rather than an advantage. It may be due to my age, but I still prefer a multimeter where the user has to manually set the measurement function. Constantly jumping to 'ohm' in the automatic measuring function if you do not measure voltage for a moment becomes irritating after a while. Read my test of this multimeter: https://chinese-electronics-products-tested.blogspot.com/p/aneng-683-smart-multimeter-tested.html
ANENG 683 Smart Multimeter High-end Touch 6000 Counts Multimetro Test Rechargeable Multitester AC/DC Voltage Tester Current Tool
US$34.99 US$54.99
1
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Comments (1)
jeever 03/09/2023
Too bad, very bad that this multimeter fails when measuring small capacitors. You can only reliably measure from 10 nF and up. All other measurement functions meet the specifications excellently. Working with the IR camera, with the logger and with the software is also all excellent, although we would have liked to see the accuracy of the IR sensor a bit better. Our advice to the manufacturer is to include in a future version of the firmware the 'REL' function present in almost every multimeter. That could solve the problems when measuring small capacitors and could also compensate for the parasitic resistance of the test leads when measuring small resistances. Our conclusion is that we find the ET12S an excellent little meter for everyday hobby electronics work. However, do not use it extensively in mains voltage circuits, because we find the input circuitry a bit too fragile to confidently recommend using it in 230 V systems.
TOOLTOP ET11S/ET12S 2In1 Thermal Imager Digital Multimeter 6000 Count Voltage Current Resistance Capacitance Diode Frequency Tester PC Data Transfer
US$92.00 US$199.00
3
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Comments (2)
jeever 27/11/2019
It will be clear to you that we are quite enthusiastic about the MDS8207. For the first time we were confronted with a combimeter costing less than a hundred euros, of which we did not have to judge the oscilloscope function as an unusable toy. Leaving aside the poor measurement results of the temperature and frequency functions, the MDS8207 is a reliable companion that provides you with accurate measurement results. It is a pity that the cursor functions were not yet implemented in the specimen supplied to us. But even without these functions, the MDS8207 is worth the money as a oscilloscope.
Upgraded MUSTOOL MDS8207 Intelligent 2 in 1 Digital 40MHz 200Msps/S Oscilloscope 6000 Counts True RMS Multimeter
US$104.39 US$109.99
3
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Comments (0)
jeever 12/09/2023
What is not mentioned in the description is that some of the parts are as SMD, so you need to have experience soldering those extremely small parts. The PCB layout is also not very solder-friendly. For example, the three pads for the transistors are unnecessarily close together, which can easily create solder bridges. One criticism is that all the components are crammed into a bag that is far too small, so that in my copy, for example, the pins of the IC were bent. The scale does an excellent job and is very accurate. We weighed several items and compared the results with these on a much more expensive scale from SOEHNLE. The discrepancies were minimal, often less than 2%.
DIY 51 Single Chip Microcomputer Electronic Scale Production Kit
US$13.29 US$15.99
0
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Comments (1)
jeever 23/09/2021
The internal looks neat and tidy. On the left you see the mains filter and next to it the rectifier of the mains voltage with two large smoothing capacitors. The electronics are still very traditionally built with axial components on a single-sided PCB with wire bridges. You will search without success for SMD components. Notice that isolation slots are milled into the PCB in many places. The heavier components are fixed with sealant. All in all, this power supply makes a reliable impression. We could not resist performing a few tests on this power supply. Our specimen produced a voltage of 65.263 V without load. Loaded with a current of 5.5 A, the voltage drops to 65.134 V. The voltage drop is thus 129 mV. This corresponds to an output stability of 0.20 %. The figure below compares the hum and noise at no-load (left) and full-load (right). The peak-to-peak value of the noise and ripple at full load is therefore 250 mV.
RIDEN® RD6006/RD6006-W LED Switching Power Supply S-400W-48V/DC12V/24V/36V/60V 8.3A-33.3A Support Monitoring Transformer Lighting
US$34.99 US$51.83
11
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Comments (1)
jeever 28/02/2023
We have worked around with about five function generators in this price range over the past three years. So we can make some comparisons. The ET3320C comes out of this comparison as the best and most versatile function generator without any reservations. With this device, 'East Tester' has set a new standard on the market! We can unreservedly recommend this function generator to any serious hobbyist who wants to buy a good and versatile function generator for not too much money. The only two points of criticism, but immediately very serious ones, are the lack of a fuse in the primary supply circuit and the fact that the ground of the three BNC connectors is connected to the mains plug ground only via the PCB.
East Tester Dual Channel Function Arbitrary Waveform Generator 20Mhz 40Mhz 60Mhz Frequency Meter Signal Source ET3320C ET3340C ET3360C
US$109.99 US$139.99
3
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Comments (2)
jeever 14/08/2023
If you google the term 'breakdown voltage meter', you will find that although there is equipment that can measure this voltage, you have to pay hundreds to over a thousand euros for it. If you only occasionally feel the need to measure the breakdown voltage of a component, this small and inexpensive device offers a useful alternative to its much more expensive counterparts. That there is such a large ripple on the output voltage of 600 V may not be as it should be, but that probably has very little impact on measuring the breakdown voltage of a component.
110V-2600V IGBT Transistor Voltage Capability Tester Diode MOS Triode Digital Voltmeter Testing Tool Withstand Voltage Tester
US$22.99 US$45.99
0
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Comments (0)
jeever 14/09/2022
The electronics of the GY20451 The version of the GY20451 supplied to us contains only ten electronic parts. Thus, the scheme is quickly reconstructed and worked out in the illustration below. The 12 V supply voltage is converted into 5 Vdc in U1, an AMS1117, to power the microcontroller. Both the input and output of this stabilizer are decoupled with capacitors C5, C1 and C2. LED1 is connected to the 5 V output via the series resistor R1. An STC15W104 is used as microcontroller. It has a built-in clock generator, so no external parts are necessary in this scheme. Two square waves with a frequency of 40 kHz appear at the outputs P3.2 and P3.3. These two signals drive the two inputs of U3, a TCA4427. That is a double 'High-speed Power MOSFET Driver'. The outputs are connected by means of two MOSFETs either to ground or to the 12 V power supply. These two outputs directly feed the two piezoceramic resonators TX1 and TX2.
Ultrasonic Suspension Electronic DIY Production Parts Wave Soldering Training DIY Kit Science Experiment
US$13.99
11
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Comments (5)
jeever 03/06/2023
Nothing but praise about the device itself. This multimeter is a very versatile device that offers more features and functions than many of its much more expensive counterparts. The accuracy of most measurements is excellent. Only when measuring electrolytics does this multimeter go wrong, but it shares this ailment with almost all multimeters that work according to the measurement system. The hardware, in our opinion, can only be criticised in detail. For instance, we find it rather irritating that the built-in beeper always beeps loudly when automatically switching from one measuring range to another. An option to switch off the beeper would be welcome! An additional range up to 10,000 μF for measuring large supply electrodes would obviously be a very practical addition. The input protection with a MOV switched directly between the 'COM' and the 'V/Ω/Hz' does not deserve any beauty prize in theory, but in daily hobby practice you will have very little trouble with it. After all, when do you measure voltages over 250 V? Never! One criticism of the firmware is that setting up and operating some functions is not very intuitive. Without reading the manual you will get stuck! For functions not often used, such as setting upper and lower thresholds, you will have to search the manual again and again for how it works. Our opinion of the software can be given with just one word: worthless!
DM8145 4 7/8 Bench top Multimeter 1000V 20A 80000 Counts Digital Multimeter tester Auto Range Multimetro Digital Voltmeter Ohm
US$199.99 US$209.99
2
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Comments (1)
jeever 10/08/2018
The five delivered transistors have better specifications than the datasheet of the 2N3055 mentions. In the attached table, the current gains Ic/Ib and the base/emitter voltages Vbe of the five delivered transistors are summarized. According to the specifications, the current gain is 20 to 70. Decision: excellent quality!
5pcs 2N3055 NPN High Power Amplifier And Switching Transistor TO-3
US$6.20 US$7.99
3
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Comments (0)
jeever 17/04/2023
The most important question: does steam come out? Yes indeed, and not by much! We stuck a transducer to the bottom of a small dish (with a gap, of course). Then we filled the dish with a little water until the transducer was just submerged. And then put the voltage on it! To make the result very clear, we filmed it in a fully darkened room with special lighting, so you can clearly see the water mist produced. Quite impressive, isn't it? Such a heap of mist from such a small compoment!
WHTCA01 Type-C USB Mini Humidifier DIY Kit Mist Maker Driver Circuit Board Fogger Atomization Film Atomizer
US$5.55 US$5.99
0
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Comments (0)
jeever 05/04/2023
We would call the S1 a 'fashion conscious' multimeter. 'Fashion conscious' because the design goes along with the trend of hand-held devices resembling a smartphone. However, is the S1 worth its price? For thesame price, you can buy a lot of multimeters that measure currents and have a 'REL' function and/or a 'MIN/MAX' function. Moreover, there are meters that have a more sensitive range than 9.999 V. The only extra useful thing about the S1 is its rechargeable battery, as most multimeters work with non-rechargeable batteries that sometimes run out of power at the most undesirable times. A wall outlet and a USB charger can always be found near the measurements. In terms of measurement accuracy, the S1 meets most of its specifications. You can trust this device to measure voltages, resistances and frequencies almost flawlessly. But that too is a feature that many identically priced meters have. So FNIRSI's S1 will be purchased mainly for its fashionable appearance. Indeed, we can imagine that a lot of technicians will fall in love with this nice-to-handle, smartphone-like and easy-to-operate little meter and would love to get it as their second (or third) multimeter for that affordable price.
FNIRSI-S1 9999 Counts Digital Multimeter AC DC Voltage Resistance Capacitance Diode NCV Hertz Live Wire Tester with Thermocouple
US$29.99
0
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Comments (0)
jeever 11/11/2019
It will be clear that this power supply is an example of superior Chinese technology. The measured performance can be called brilliant. The way in which this device is constructed is also taken care of in detail. Another question is whether this power supply is useful in use. My opinion: no! The dimensions are in fact too small to be applied conveniently in daily laboratory practice. Just give me a traditional power supply with potentiometers to set the voltage and current. The last question to be answered is how the price/performance ratio of the MDP-P905 can be assessed. My answer is that this power supply is too expensive for what the device performs. In terms of specifications similar power supplies are for sale for prices around € 60.00. The MDP-P905 is in my opinion a gadget for technicians who do not mind spending some extra money on a product that clearly distinguishes itself from the competition.
MDP-XP 30V/5A 90W 2.4G Wireless Connection Digital Programmable Power System with 2.8-inch TFT Screen Monitor Automatic Matching Control 6 Sub-modules
US$193.49 US$257.99
16
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Comments (3)
jeever 07/10/2022
A major improvement is that the column on which the microscope is mounted can tilt backwards, so that much more space is available for soldering a PCB on the base. Tilting also helps against reflections in the image and it is much easier to decipher the lasered texts on chips at a certain angle. The LED lighting works great when it comes to getting a sharp and clear image of a detail of a part or a solder weld on a PCB. However, the color fidelity is worthless with this cold white lighting. If you want to take a nice picture of a small PCB, it is best to switch off the LEDs and use the natural ambient light. The microscope then provides much nicer and more color-true images. It often happens that we sell a tested product for half the price to one of our readers. That won't happen with this G1200(D) microscope! We keep it as a very worthy replacement for our old G600. After all, we are very satisfied with the quality and sturdiness of the G1200(D). The only downside that we can think of is the mechanical instability already described when you press one of the buttons, which causes the image to vibrate. A second later, however, the device gives a stable image again, you have very little trouble with it in practice.
G1200D Digital Microscope 12MP 7 Inch Large Color Screen Large Base LCD Display 1-1200X Continuous with Light
US$74.69 US$99.99
2
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Comments (0)
jeever 29/06/2021
The radio is powered from a 5 V USB mains power supply which is not supplied. Included is a power cable from USB-A to standard 5.5 x 2.1 mm power plug. Dominant on the front panel is the display. It shows '==STEREO RADIO==', but that does not make sense, as the radio has only one built-in speaker and is therefore mono. Above the display is a row of ten LEDs. These form a double LED VU-meter, controlled by two KA2284 chips. Below the display, there are two large red push button switches and four small black push buttons. The left red switch turns the radio on or off. Irritating is that the last settings are not stored in the memory. The radio will always start up at the lowest frequency in the FM band that gives an acceptable signal and with the volume set to 8.
Geekcreit® DIY Radio Electronic Kit Parts 51 Single-chip FM Digital Sound Machine
US$19.99 US$23.99
7
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Comments (2)
jeever 31/10/2018
This five-meter-long light-strip is composed of segments that are exactly 50 mm long and each contain three RGB-LEDs plus three series resistors to feed the whole from 12 Vdc. There is a cut-line between two segments, you can cut the ribbon there so that you can adjust the dimensions of the light tube. The strip is provided on the back with a good adhesive layer VHB Adhesive from 3M with protective sheet. After removal of the protective sheet, you can easily attach the strip to any smooth surface. The LEDs use the following currents: red LEDs 864 mA, blue LEDs 673 mA, green LEDs 723 mA. The internal resistance of the five meters for the red voltage line is 4.3 ohms, the blue voltage line 3.8 ohms and the green voltage line 3.8 ohms.
5M RGB Non-Waterproof 300 LED SMD5050 LED Strip Light Led Streifen for Indoor Home Decoration DC12V
US$8.23 US$15.99
37
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Comments (1)
jeever 23/09/2021
It will be clear from the test results that there are really no points of criticism about this module. If you need to accurately measure a DC voltage somewhere, you can use this inexpensive module without any hesitation. Read my test/review: https://chinese-electronics-products-tested.blogspot.com/p/33000-vdc-digital-panel-meter-tested.html
DC 4V-30V 0.36 Inch 5 Digit Mini LED Display Digital Voltmeter Voltage Test Panel Meter High Accuracy 3 Wires
US$8.11 US$14.99
4
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Comments (0)
jeever 13/04/2018
Most wire-wound high-power resistors are quite inaccurate. We tested these resistances by sending a constant current of 1.00 A and measuring the DC voltage across the resistors, see the diagram below. The results are excellent, see the attached table. Conclusion: the most accurate power resistors ever bought!
100W Watt Power Metal Shell Case Wirewound Resistor
US$4.44 US$9.99
4
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