Here is the P1 preamplifier featuring tone controls. I make no claims rather its smart and handy comments welcome
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
Nice work horse. Put current sources on the opamp outputs and use a series/shunt regulated supply and it will sing pretty good.
Thank you. Yes class A operation of opamps is quite popular and a regulated supply for them may win the day
Please. Can you add a 'direct' conmutator for bypass the tones?
Thank you. This preamp is very application specific. Bypassing the tones means you are looking for something else, which may also have a better approach
The preamp could be expanded to a fully fledged flexible model with the addition of more amplification stages, to cater for balanced in and out and tone bypass and high pass and low pass filter etc or it could be stripped down to an active volume control . But then it would have become something else
Last edited:
High quality 0.01uf supply filter caps tied as close as possible to the opamp supply pins will help with hf accuracy.
Thank you . One could do that, however in light of the input filter and a regulated linear power supply, not forgetting a good source of the chips and good PCB layout, we may get away without them . Yes its a good idea.
A good project for next free PCBs. Lets have your comments
Hi All,
I want to try this preamp if there's pcb layout. Appreciate if someone can make a pcb layout. Thanks in advance.
Regards,
Boyet
Hi Boyet,
Thank you for your interest. Drowranger had created some PCBs layouts for this maybe he might be willing to share. Hes rather quiet though hope hes okay.
kind regards,
Harrison.
Thank you for your interest. Drowranger had created some PCBs layouts for this maybe he might be willing to share. Hes rather quiet though hope hes okay.
kind regards,
Harrison.
Hi All,
I want to try this preamp if there's pcb layout. Appreciate if someone can make a pcb layout. Thanks in advance.
Regards,
Boyet
The first set of pots to act as volume can be a stereo potentiometer.
For a stereo version some may be wondering how balance is achieved ? Well it is achieved by having separate controllers for the second set of potentiometers.
The second set of potentiometers can also reset the line voltages by having pots of lets say 50k. cool and neat at the same time. Now how many line preamp s can beat that
Come forward claim your reward
For a stereo version some may be wondering how balance is achieved ? Well it is achieved by having separate controllers for the second set of potentiometers.
The second set of potentiometers can also reset the line voltages by having pots of lets say 50k. cool and neat at the same time. Now how many line preamp s can beat that
Come forward claim your reward
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Source & Line
- Analog Line Level
- P1 preamplifier