Hi Andrew,
I´m writing a short specification. Posting it still sunday! Have to finish the specification of the PSU for tube amplifier posted in an other thread.
3 stage:
- voltage amplfier,
- current amplifier,
- and current source (LM338K).
You can use LF351, but I like the original PHILIPS NE5534.
Take a look at the LM395, is not a standard transistor. TO3 case is obsolete, we have to use the TO220 case.
I´m writing a short specification. Posting it still sunday! Have to finish the specification of the PSU for tube amplifier posted in an other thread.
3 stage:
- voltage amplfier,
- current amplifier,
- and current source (LM338K).
You can use LF351, but I like the original PHILIPS NE5534.
Take a look at the LM395, is not a standard transistor. TO3 case is obsolete, we have to use the TO220 case.
look at the data sheet to see how to configure a CCS.Jean-Paul_2 said:violated TO3 regulator symbol from EAGLE:
- OUT is IN,
- IN is ADJ,
- and GND is OUT.
I had to post this 7times to bypass the 60 second limit and I am not a fast typer.
'cause of your drawing errors the amplifier doesn't work.
Compare it against the original natsemi circuit!
Hopefully they pulled this circuit from a reliable piece of equipment and not just published some first work from their lab trainee.
Nevertheless the idea of taming an emitterfollower with currentsource inside the feedbackloop of an opamp is not bad and worth some experiments.
I just think, that this old application is a bad starting point!
regards
Compare it against the original natsemi circuit!
I don't like the old datasheet application either. It looks to me like a 'nailed together' circuit, which only purpose seems to be to utilise as much expensive national semiconductor parts as possible.What do you think?
Hopefully they pulled this circuit from a reliable piece of equipment and not just published some first work from their lab trainee.
Nevertheless the idea of taming an emitterfollower with currentsource inside the feedbackloop of an opamp is not bad and worth some experiments.
I just think, that this old application is a bad starting point!
regards
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