I've found a circuit that I think will be really cool to take to a final project. My goal is to eventually get it to a useable bench supply.
Currently I have it bread-boarded and seems to be working fairly well.
Here's the schematic:
I have had to substitute some parts but it still works.
Substitutions:
U1, U3 LM317, LM337 == NTE956(pos), NTE957(neg)
U2 = LM301 == LM741, tried TL070 too
-- these are the only op amps that I've tried - any recommendations that might be better suited.
Some observations:
1) D2 (LED) needs to be flipped - (to forward bias) <-- feel free to correct me here if I'm describing it wrong.
2) the voltage as measured with my hand held voltmeter shows about 10-20 milliamps difference in the positive value and the negative value. I'm not sure if this is a function of the meter's summing, or the breadboard variations or my component substitutions
More to follow as I'd like to document this project as it evolves,
Paul
Attached is a slightly larger version of the schematic that's easier to read.
Currently I have it bread-boarded and seems to be working fairly well.
Here's the schematic:
I have had to substitute some parts but it still works.
Substitutions:
U1, U3 LM317, LM337 == NTE956(pos), NTE957(neg)
U2 = LM301 == LM741, tried TL070 too
-- these are the only op amps that I've tried - any recommendations that might be better suited.
Some observations:
1) D2 (LED) needs to be flipped - (to forward bias) <-- feel free to correct me here if I'm describing it wrong.
2) the voltage as measured with my hand held voltmeter shows about 10-20 milliamps difference in the positive value and the negative value. I'm not sure if this is a function of the meter's summing, or the breadboard variations or my component substitutions
More to follow as I'd like to document this project as it evolves,
Paul
Attached is a slightly larger version of the schematic that's easier to read.
Attachments
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