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Old 15th July 2009, 10:53 AM   #11
AndrewT is offline AndrewT  Scotland
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3V and 60mA to 80mA for a 2sk170.
What are you trying to do with the 2sk170?
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 15th July 2009, 03:00 PM   #12
Bengali is offline Bengali  United States
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You could use the similar circuit for lower voltage. Like 3 Volt. If you replace transistors with BJT, Bipolar.

This will give a voltage drop from B (=zener) to E (output) like -0.7 Volt only.
With very small changes depending on current drawn.

Depending on how much current you need you can select suitable devices.
For <500 mA then BD139 and BD140 would work well.
For higher currents we can use MJE15030/MJE15031
thanks. that was also suggested to me. I decided to keep it simple and use the LM317/L337.

3V and 60mA to 80mA for a 2sk170.
I posted the circuit on the jboz postings. 60-80mA is total,
it will be driving 7 channels, 7 seperate 2sk170's.

I'm boosting the line level from my AVR to my external
amp. Too much loss from my maggies. Battery power
version has been built up and sounds just wonderful.
so I've been looking for a very low noise +24V & -3V
psu to power it.

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Old 15th July 2009, 03:31 PM   #13
lineup is offline lineup  Sweden
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Location: the north
That is a good choice.
Will give a very precise voltage.

I have used LM317 many times.
These 3-pin regulators are very easy to work with after you have done it a couple of time.
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