I have a couple of questions regarding the circuit in fig. 16 in Nelson's DIY Opamp article.
1)I want to operate it at a gain of 10db, is it likely to be stable?If not will adding a cap (like say a 100pf poly) across feedback resistor Rd likely to help it be so?
2)Will adding a 150 ohm pot in series with the 1.5k (R2)resistor give me some offset adjustment if I want to direct couple the output.
Any input would be apreciated.Thanks in advance.
1)I want to operate it at a gain of 10db, is it likely to be stable?If not will adding a cap (like say a 100pf poly) across feedback resistor Rd likely to help it be so?
2)Will adding a 150 ohm pot in series with the 1.5k (R2)resistor give me some offset adjustment if I want to direct couple the output.
Any input would be apreciated.Thanks in advance.
Sorry I should have posted a link to the article.Fig 16 is on page 8. http://www.passdiy.com/pdf/diyopamp.pdf
F1 FAN said:
I would expect that to be stable at 10 dB. I suggest a Gate resistor
in series on the P channel Mosfet.
Thanks Nelson for the reply,I shall place a 221R on the gate of the Mosfet.
Thanks BDP for the link to that thread.I will give it a good read.
Thanks BDP for the link to that thread.I will give it a good read.
The ZVP3310 probably favors higher values, but the way to tell
is if it oscillates, and that requires a scope.
You can alternatively uses a PNP transistor with an adjusted value
off the Drain of the input transistor to give about .7V across it.
is if it oscillates, and that requires a scope.
You can alternatively uses a PNP transistor with an adjusted value
off the Drain of the input transistor to give about .7V across it.
- Status
- Not open for further replies.