Designing dual linear power supply

[networkingdude]

I would like to do a power supply with op amps in the future. Interestingly the LM723 appears to have a worse noise figure than the LM350 I am using here. I'm sure I'm missing something important here.

[bdunham7]

For 1A the component values are OK. If you dont want to think about current limiting use a fuse.´ or a "weaker" regulator chip.
If you need better regulation, less noise, ... you could go for a bit more complex design using op amps or a 723.

You have to consider all the factors.  A smaller regulator will need a larger heatsink, for example.  Also, the circuit as drawn may outperform more 'sophisticated' systems unless they are very carefully designed and tested.  Some pretty high end test equipment uses prepackaged regulators in the power supply section, including long-scale DMMs.

[Kibabalu]

Regarding needed space for big capacitors on the PCB it could be beneficial, to use a 'capacitance multiplier' (I don't like this label, because it doesn't multiply any capacitances, but this the name, especially in the english spoken community) like the one inside the design shown in post #48.

With that the capacitors don't have to deliver any big current, because the current is is supplied by the emitter follower bypassing the capacitances. The input voltage of the voltage controller is now very smooth, resp. ripple and noise suppressed are very good, just like you would have used very big capacitors.

[feihong519]

你好，虽然IC最大支持3A，但实际工作中达不到3A电流。如果实际输出电流为2A，你应该考虑一下IC的散热的问题。
Hello, although the IC supports a maximum of 3A, it cannot reach 3A in actual work. If the actual output current is 2A, you should consider the heat dissipation of the IC.

[David Hess]

The output capacitor value of 1500uF is especially large, against the 10uF usual value, which might not be needed or even bad to the overall performance of the regulator.

As for the output cap, the 1uf are all solid tants and the large capacitor idea was on a commercial product so I figured it was helpful.

An output capacitor size of 10 to 100 microfarads per amp is typical.  Small RF bypass capacitors might be added at the external terminals to chassis ground.

D1 and D4 are in place as per the datasheet.  Diode D1 and D4 protects against C4,C5,C9 and C10 discharging into regulator.
D2 and D5 protect adjustment pin from C3 and C8.
I will be removing D3 and D6 as they appear redundant.

I would not remove D3 and D6; they are commonly included in dual bipolar power supplies.  They protect the regulators against an output short from the positive to negative output where one regulator will try to drive a reverse voltage into the other regulator.