R104
If you change the current,
(which I do not think will effect the performance
in any mentionable way,)
you get another voltage at the output. 20 volts it was.
Then you might need to change the value of R104
to get 20 volts again.
(Pass have chosen 20 volts.
And certainly he has a reason for that. Transistor operates good at 20 volts/40mA.)
Change of R104 will change the gain. R104/R108= 10
Gain is R104 and 5kpot+load, in paralellell.
Original this is about 800 ohms giving a gain of 8.
And if you want to keep gain at 8, and change R104
you will have to change R108 accordingly.
If you change the current,
(which I do not think will effect the performance
in any mentionable way,)
you get another voltage at the output. 20 volts it was.
Then you might need to change the value of R104
to get 20 volts again.
(Pass have chosen 20 volts.
And certainly he has a reason for that. Transistor operates good at 20 volts/40mA.)
Change of R104 will change the gain. R104/R108= 10
Gain is R104 and 5kpot+load, in paralellell.
Original this is about 800 ohms giving a gain of 8.
And if you want to keep gain at 8, and change R104
you will have to change R108 accordingly.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.