Golden Reference power supply
The ultimate adjustable low voltage supply
BOM
Kevin's BOM this and Multiamp/Dynalobal
Thread here
Schematic
digikey carries the LT1021-10
one tantalum cap across the zener could stay at 25V, but for up to 45V output voltage, the other tantalum cap should be rated at 35V or higher
you can with parts changes including higher voltage rating caps, and opa445's take the output voltage all the way up to +/-60Vthis is set for +/-20, so if you want other voltages you have to change the feedback resistors.
its a 10 volt reference, the feedback resistors are 1.5k which is a divide by 2. (change R8,R9)
So if you change the top 1.5k resistor you can get any voltage you want. 750 ohms makes it 15v
The regulated output voltage is:
for V+: (R8 + R7) / R7 x 10 (reference voltage of D5 - LT1021-10)
for V-: (R9 + R10) / R10 x 10 (reference voltage of D7 - LT1021-10)
Kevin's formula is more accurately shown as ((R8 + R7) / R7) x 10
On the goldenreference4 board silkscreen, R7, R8, R9 R10 are all 1.5K. R7 and R8 are connected and R9 and R10 are connected. R8 and R9 are the 1.5K resistors closer to the DN2540 on each side of the board.
OR desired voltage x 150 -1500 = R8, R9
40v is 40 x150=6000 -1500=4500
30v is 3K
25v is 2250R
20v=1500
18v=1200
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