Blok Pitaniya S Regulirovkoj Toka I Napryazheniya Na Lm317

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So, the previous article about lab power supply gathered quite a interest which is not a big surprise considering that there are over 200 pages of discussions in two topics about the schematic in this forum:! I think that the schematic in is not the original one but a modification of an older schematic published in a Czech electronic magazine. I found it here: There are scanned pages from the magazine with the original article and eagle files for the project. With the original schematic at hand I took the liberty to make a few changes. First of all I replaced two transistor-zener regulators with LM317L/LM337L. Circuits are calculated to produce 33V positive and 3V negative voltages. Thus total supply voltage for the opamps does not exceed 36V and therefor we may use standard ones.

I also made changes in the LED drive circuit and a few other minor changes. The resulting schematic was this. After that I decided to simplify the schematic even further. I replaced unnecessary complicated circuit for voltage reference build with IC2 with simple resistor-zener circuit. This will give us stable reference voltage as the supply voltage is already regulated with LM317. In the original schematic voltage reference is 9.4V so I chose to use two zeners - 3.3V and 6.2V connected in series which should give us 9.5V.