Are there any drawbacks upon building an Aleph clone all with BJTs ?
Like
- KSA1220A/MJE350 in the input stage with MJE15033 as current source
- Darlingtons MJ11032/MJ11016 or "custom darlingotns" with MJE243+MJ15003 or MJL3281
I'm simulating such a configuration and it seems to work ok, at least for DC operating point and transient analysis.
Thank You
Like
- KSA1220A/MJE350 in the input stage with MJE15033 as current source
- Darlingtons MJ11032/MJ11016 or "custom darlingotns" with MJE243+MJ15003 or MJL3281
I'm simulating such a configuration and it seems to work ok, at least for DC operating point and transient analysis.
Thank You
Mosfets are favored because of their high input impedance
and also because their high Vgs makes it easy to insert control
circuits that operate at 4 volts or so, rather than the 1.4 volts
seen in a darlington.
and also because their high Vgs makes it easy to insert control
circuits that operate at 4 volts or so, rather than the 1.4 volts
seen in a darlington.
The lower input ipedance of BJT requires higher current from the input differential pair; I'm getting good results (in simulation) with about 25 mA each.
Due to their lower Collector-Emiter on resistence BJTs should give you a lower output impedence also for low power versions of the clones (A5 and A3) and thus a better control like the big Aleph 1.2 and 2.
Due to their lower Collector-Emiter on resistence BJTs should give you a lower output impedence also for low power versions of the clones (A5 and A3) and thus a better control like the big Aleph 1.2 and 2.
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