Thank you klewis, your work is very neat & looks professional I never will arrive to this quality.
I will try to make a 12R positive 21Vin/12V out, also 12R minus -21Vin/-12Vout.
Can I use BF245A for Q8(2N5457) and 2SK170 for Q3(2N5459)?
Can I use BF245A for Q8(2N5457) and 2SK170 for Q3(2N5459)?
For Q8 you can use BF245A, for Q3 you can't use 2SK170. But you can try BF245B if you can find instead of 5459.
Hi Salas,
I've been able to get the V1.2R up and running with heat sinks and about 60vout on both channels. As I was setting it up, I was running it for brief periods without the heat sinks for ease of setup, changing out the voltage setting resistors. So, I never ran it for periods longer than 10 or 15 seconds. Now with the heat-sinks on I have run it for longer periods and it's doing the Vout climbing voltage thing again. The fix you suggested for the V1.2 stopped the Vout climb, but, apparently isn't doing the trick here.
Any thoughts? I hope you enjoy challenges...😉
Regards,
Ken
I've been able to get the V1.2R up and running with heat sinks and about 60vout on both channels. As I was setting it up, I was running it for brief periods without the heat sinks for ease of setup, changing out the voltage setting resistors. So, I never ran it for periods longer than 10 or 15 seconds. Now with the heat-sinks on I have run it for longer periods and it's doing the Vout climbing voltage thing again. The fix you suggested for the V1.2 stopped the Vout climb, but, apparently isn't doing the trick here.
Any thoughts? I hope you enjoy challenges...😉
Regards,
Ken
V1.2R has another error amp's base resistor than V1.2. Much larger. Its all about the tempco of the Jfet and the Bjt to find some balance. Try one Led in series with the ref resistor at its root over the fet. Sometimes it counteracts a bit.
Yep, and looking the other way in the positive. Will contribute a couple of Volt also but you can trim those out from the resistor if it will be helping the drift.
- Status
- Not open for further replies.