If the regulators are attached to that style of heatsink before soldering them down it can at least be assembled, but then there is no proper screwdriver access to the machine screws.
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I guess I should've called it a step down voltage regulator. The idea is that there is a separate board with rectifier bridge and filtering caps for 30V or 35V. For example to power a chip amp like TDA7293 or LM3886. Now, to be able to add additional chips (NE5532, LM4562) for balanced audio signal for example, we need 15V
If you add pads for the rectifiers and caps it will be universal and more broadly applicable. Just that. Ah I see what the application is now.
For opamps and sensitive analog electronics maybe better regs could be used. Generally one uses +/- 12 ... 15V for this application as not every opamp has rail to rail outputs and one wishes some headroom. For +/- 15V output voltages +/- 30V input voltages means a voltage drop of 15V and this twice. That can be a very hot PSU with those small heatsinks. For the standard +/- 12 ....15V the regs would need at least around +/- 15...18V input not taking ripple voltage etc. into account. I suggest keeping to +/- 12V for long opamp life and enough headroom with most opamps. If you want a relatively cool PSU and a green design you could think of a small separate transformer like a 2 x 12...15V one in the 5 to 10VA range depending on the amount of opamps. With large enough filter caps ripple voltage will be low enough for the PSU to function properly. With light loads the small transformers will have higher output voltage anyway.
If you add pads for parallel resistors to R1/R2 you can fine tune the output voltages.
Constructive criticism....
For opamps and sensitive analog electronics maybe better regs could be used. Generally one uses +/- 12 ... 15V for this application as not every opamp has rail to rail outputs and one wishes some headroom. For +/- 15V output voltages +/- 30V input voltages means a voltage drop of 15V and this twice. That can be a very hot PSU with those small heatsinks. For the standard +/- 12 ....15V the regs would need at least around +/- 15...18V input not taking ripple voltage etc. into account. I suggest keeping to +/- 12V for long opamp life and enough headroom with most opamps. If you want a relatively cool PSU and a green design you could think of a small separate transformer like a 2 x 12...15V one in the 5 to 10VA range depending on the amount of opamps. With large enough filter caps ripple voltage will be low enough for the PSU to function properly. With light loads the small transformers will have higher output voltage anyway.
If you add pads for parallel resistors to R1/R2 you can fine tune the output voltages.
Constructive criticism....
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