ohyva
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ohyva 04/07/2018
The components and PCB are standard quality. Some component values differ from those in the schematics. The big capacitors were 2200 uF and 330 uF, which are good improvement. The LED series resistor was 4.7 k which cause some problems. In my package there was only one 120 ohm resistor where there should have been 2 and two 4.7 k resists when only one is used. The voltage adjustment components are poorly selected. The 120 ohm resistor provide roughly 10 mA to the 10 k multiturn trimmer resistor meaning the adjustment range is between 1.2 V to roughly 100 V! The LM317/337 an handle only max 37 V. I modified my circuits by using 360 ohm resistors instead. Note that LM317/337 are guaranteed to operate with minimum output current of 10 mA. The 360 ohm resistor does not guarantee that. A bigger and perhaps dangerous problem is the LED series resistor which is too small. The schematics says this should be 10 k, which also may be too low unless you use a power resistor. The maximum voltage over the resistor is roughly 70 V which means close 0.5 W power when 10 k resistor is used. And over 1 W when 4.7 k resistor is used. When I first time powered up my regulator there was a clear burning smell. Fortunately I used only 12 V transformer so the output levels were a bit over 16 V or 32 V total over the resistor+LED. I fast reduced the output to +/- 9V which was OK. When I tested +/-15V the temperature of the resistor rapidly rose to over 130 celsius!
LM317 Adjustable Filtering Power Supply LM337 Voltage Regulator Module DIY Kit
US$8.87 US$16.99
3
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Comments (1)
ohyva 21/08/2018
Silicon wire leads softer and more flexible that standard PVC ones though not as soft as flexible as the best one I have used. Wires quite thick which means some inflexibility but also low resistance and high current capability, Lead connectors OK. Probes with replaceable pins OK but a bit clumsy ones. Packaging was not so good and the connector ends of the probes somewhat squeezed but you can still get the lead connectors attached. I left the leads connected to see if that can shape the probe ends. Replaceable probe pins are nice. The sharp ones are good for SMD probing. Alligator clips are OK.
12 in 1 Super Multi-meter Probe Replaceable Probe Clamp Meter Test Lead Kit with Alligator Clips
US$11.08
0
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ohyva 21/08/2018
Silicon wire as expected. Not as soft as the best silicon wires I have used. Stands soldering heat nicely. I have not tested the maximum heat tolerance where promise is 200 deg C.
DANIU 5 Meter Black Silicone Wire Cable 10/12/14/16/18/20/22AWG Flexible Cable
US$4.88 US$9.99
0
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ohyva 21/08/2018
Silicon wire as expected. Not as soft as the best silicon wires I have used. Stands soldering heat nicely. I have not tested the maximum heat tolerance where promise is 200 deg C. Perfect match with the insulated 4mm stackable banana plugs (SKU 1259280).
DANIU 10 Meter Black Silicone Wire Cable 10/12/14/16/18/20/22AWG Flexible Cable
US$8.99 US$10.99
0
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ohyva 21/08/2018
Silicon wire as expected. Not as soft as the best silicon wires I have used. Stands soldering heat nicely. I have not tested the maximum heat tolerance where promise is 200 deg C. Perfect match with the insulated 4mm stackable banana plugs (SKU 1259280).
DANIU 10 Meter Red Silicone Wire Cable 10/12/14/16/18/20/22AWG Flexible Cable
US$5.67 US$9.99
0
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ohyva 21/08/2018
Silicon wire as expected. Not as soft as the best silicon wires I have used. Stands soldering heat nicely. I have not tested the maximum heat tolerance where promise is 200 deg C.
DANIU 5 Meter Red Silicone Wire Cable 10/12/14/16/18/20/22AWG Flexible Cable
US$7.99 US$8.99
0
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ohyva 06/08/2018
Both shell and connector parts well made. Puts together nicely. You need quite a lot of heat to solder the wire - my 40W soldering iron was just enough. Perfect match with AWG14 silicon wire (I used the Danui wires SKU 1170303 and 1170297). The 5 pieces per color is odd number since you need typically 2 pieces per wire.
10Pcs Red/Black Safety Fully Insulated 4mm Male Stackable Banana Plug Connector
US$8.64
0
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ohyva 06/08/2018
Small wire cutting pliers you can carry with you easily. Quite sharp. Blade smoothness average. Mechanically OK. Long term durability unknown. The locking mechanism works but does not feel too reliable. Definitely worth the price.
DANIU 3.5inch Diagonal Cutting Pliers Wire Cable Side Flush Cutter Pliers with Lock Hand Tool
US$8.99 US$10.99
0
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ohyva 06/08/2018
Thin braids for narrow spaces, wide braids where lots of solder to remove. Works as expected.
Hot 5 Pcs Desoldering Braid Solder Remover Wick Wire Soldering Tools CP-1515/2015/2515/3015/3515
US$5.56
0
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ohyva 28/07/2018
Sturdy structure. Lock rings work quite smoothly. Fit perfectly with safety banana leads (SKU 1136464).
5PCs 4mm Binding Post Banana Jack Socket Panel Mount
US$2.99
0
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ohyva 04/07/2018
A small package of standard good quality analog regulators. I use plenty of these in my various designs.
10PCS LM317T TO-220 LM317 TO220 Original IC Adjustable Regulators
US$4.61 US$3.59
0
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ohyva 01/07/2018
Measure exact 11 mm as specified for Raspberry Pi Hats. Standard M2.5 threads fit perfectly with other M2.5 spacers, screws and nuts. Packaged in 3 small plastic bags each holding 10 pieces of spacer+screw+nut all packaged in a bit larger plastic bag.
3SETS DIY 11MM Hex Brass Cylinder + Screw + Nut Kits For Raspberry Pi
US$8.25 US$14.99
0
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ohyva 22/06/2018
T bought these together with P5008 probes to have needles suitable for measuring components in very small SMD packages. These probes has a bit high resistance roughly 0.2 ohms each.
Insulation Piercing Needle Non-destructive Multimeter Test Probes Red/Black
US$7.99
0
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Comments (0)
ohyva 22/06/2018
Probes are thin but not too thin with sharp points allowing you to contact small SMD components. These fit in your hands nicely when leads with protected banana plugs are attached. I measured these probes to have roughly 0.1 ohm resistance each.
P5008 2Pcs Multimeter Insulation Piercing Needle Non-destructive Test Probes
US$9.89 US$0.00
0
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ohyva 13/06/2018
Build is good; case is surprisingly good. DSO function just as expected. The DC accuracy is good (but you have to remember to set the zero point as instructed). I have not yet made any more laborious study with analog signals. My first impression of the controls is very positive. Putting this small device together was quite simple and straightforward. All the SMD components were already soldered to PCBs, so I needed to solder only the throughhole components. The instructions were in most places clear enough. (The only real problem I encountered was on which side of the main PCB to solder the test signal output pin - I had to check it putting the PCB inside the case and looking where the pin hole is). One small screw was missing so I had to use one from my spare part box. The display is somewhat tilted. I rechecked the build is correct so the problem must be in the preinstalled display module. This is just a minor look problem and does not affect the use of the device.
Original JYETech DSO-SHELL DSO150 15001K DIY Digital Oscilloscope Unassembled Kit With Housing
US$29.99 US$45.99
0
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ohyva 08/06/2018
Easy enough to be put together by a less experienced electronics hobbyist. The PCB is OK, The case and knobs is adequate. The operation and performance is as expected. The value for the price is good. The two smaller electrolytic capacitors are too tall to be soldered straight up. I noticed this too late and had to tilt them as much as my already cut wires allowed. I assume the smaller screws are supposed to be used to fix the PCB in the case bottom plate, but they are way too short for that purpose. I used longer screws and spacers I had instead. The longer screws are barely long enough to keep the case together. The user should also note that although the output has "GND" the signal is centered around mid of the supply voltage. I used a 9V battery in my tests so my sine signal was around 4.5 volts. You can use only roughly 1/3 of the amplitude adjustment before the signal starts to cut.
Geekcreit® XR2206 Function Signal Generator DIY Kit Sine Triangle Square Output 1HZ-1MHZ
US$5.99 US$9.79
0
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ohyva 22/05/2018
Bought this together with SKU 1142426 to get even better set of different connectors. Connector bodies as expected after using many of these. Connector pins ok when you know and accept they are not gold plated. The box is OK and after putting all the connectors in a single box this is now taken into good use with other stuff inside.
Excellway TC10 620pcs Wire Jumper Pin Header Connector Housing Kit For Dupont and Crimp Pins
US$7.35 US$11.99
0
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ohyva 22/05/2018
OK image quality to PCB inspection. You can use the smallest magnification when reworking PCB to have sufficient space between the microscope and the board. The stand is very flimsy and almost impossible to keep the image in one point when zooming. Value for money is OK.
5MP 8 LED USB Digital Camera Microscope Magnifier Lift Stand 1X-500X 5V DC Video
US$20.69 US$27.99
0
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ohyva 22/05/2018
Good protoboard with throughhole pads. Size big enough to allow all sort on PoCs to be put in one board. Good value for money.
10Pcs 90*150mm FR-4 Double-Side Prototype PCB Printed Circuit Board
US$23.99 US$28.99
0
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ohyva 22/05/2018
Build stable and sturdy enough. Quite easy to fit to PCB size. Quite easy to place and remove the PCB under work. Locking knobs could be bigger.
Pro'sKit SN-390 PCB Holder Printed Circuit Board Soldering and Assembly Holder Frame
US$23.99 US$31.00
0
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