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| Thaikit transistor curve tracer help |
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| akabek:
I assembled a curved tracer and power supply kit offered through Thaikits. I believe you can also buy it on ebay. https://www.thaikits.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_category_id=19&virtuemart_product_id=595 When I connect a working transistor to the curve tracer and a scope I only see a straight line. I do not see the stepped curves. I am a beginner when it comes to electronics but there are two ICs on the board. Do they provide the stepped curves? One chip is the Op Amps TL074CN and the other is a Counter ICs CD4024BE. The manual for this kit does not provide voltages so I am not sure how to check if they ICs are faulty. I attached a pic of what I see on the scope and the manual shows a schematic. Any suggestion? |
| TERRA Operative:
First up, you have checked your supply voltages to the PCB, and double and triple checked component orientation and that the correct parts are in the correct locations? Also, have you checked for bad or missed solder joints? I have one of these kits working, so can take measurements as needed. |
| akabek:
When I initially assembled the kit it was working but the curves were not sharp, picture attached. From the PCB board to the front panel connectors I was using regular 24AWG wire. Hoping to correct this I replaced the standard wire with shielded wire and now I only get a straight line. I figured the shield cable was causing the issue so I put the 24AWG wires back and no change. All I get now is a straight line. I checked the diodes, caps, resistor and transistors and they all look good. I also re flowed the solder at each leg and confirmed the PCB is receiving the required 15+/- V from the power supply board. |
| akabek:
I took a picture of the scope with both X/Y channels connected, only Ch1 - X and only Ch2 - Y. When only Ch2 - Y is connected there is a very short line, in the picture it looks like a dot. I am not sure if this helps at all. |
| TERRA Operative:
I had the same issue with shielded cables. It seems the increased capacitance of the shielded cable causes problems. Some ferrite beads and short unshielded cables works on mine. |
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