Okay, this is my second thread, so I hope I can attach the schema, and everyone can read it.
I recently got back into electronics as hobby, and have been working with linear power supply
circuits, learning what I can and can't do with an LM317, by-pass transistors, and the challenge
of controlling power > 1 amp, at voltages <30v.
I'm attempting to make a rough and ready bench-top power supply. I'm trying to keep it simple, later I will get to LM723, L200, switchers, etc.
I know how to make an adj. current regulator with LM317/LM338. For large currents, you need a large rheostat. So, I am trying something else.
I found a power supply circuit, and the current adjusting part used a single high power, NPN, TIP142 Darlington. I don't have one of those, but
I have several TIP102 Darlingtons in my junk box.
Here is the original circuit:
http://adjustablevoltagepower.blogspot.com/
I breadboarded, then soldered up a modified version of just the current regulation portion. It seems to work with very fine adjustment control.
Okay, that's all I've got. I can't figure out how to post my schematic jpg. If someone can help me get that posted, we can discuss it.
I recently got back into electronics as hobby, and have been working with linear power supply
circuits, learning what I can and can't do with an LM317, by-pass transistors, and the challenge
of controlling power > 1 amp, at voltages <30v.
I'm attempting to make a rough and ready bench-top power supply. I'm trying to keep it simple, later I will get to LM723, L200, switchers, etc.
I know how to make an adj. current regulator with LM317/LM338. For large currents, you need a large rheostat. So, I am trying something else.
I found a power supply circuit, and the current adjusting part used a single high power, NPN, TIP142 Darlington. I don't have one of those, but
I have several TIP102 Darlingtons in my junk box.
Here is the original circuit:
http://adjustablevoltagepower.blogspot.com/
I breadboarded, then soldered up a modified version of just the current regulation portion. It seems to work with very fine adjustment control.
Okay, that's all I've got. I can't figure out how to post my schematic jpg. If someone can help me get that posted, we can discuss it.