I do not know this circuit and I can not help you, I do not know. I bought a simple OP bracket with parts already welded. is this the best circuit with choice of coin values, i don't think so. But what I am absolutely certain, the result is perfect.
Dual OP Amp Preamp DC Amplification Empty Board for NE5532/OPA2134/OPA2604/AD826 | eBay
My
other PSU, I changed the 2 big Elna fake condos by others that.
AC-DC LM317 LM337 LF353 Servo Rectifier Filter Power Supply Module Adjustable 783710088352 | eBay
other PSU, I changed the 2 big Elna fake condos by others that.
AC-DC LM317 LM337 LF353 Servo Rectifier Filter Power Supply Module Adjustable 783710088352 | eBay
Attachments
Last edited:
Should have put the op-amp type😱 and a revision
This post probably does not belong here but I wanted to have gain or volume pots for the L12-2 amp. Something that works.
This post probably does not belong here but I wanted to have gain or volume pots for the L12-2 amp. Something that works.
Attachments
Last edited:
LJM's earlier posts, he adviced two preamp.(preamp 7 P7 mini) for L12-2. They are very simple preamp.s, first you can try them.
Last edited:
According to the description it is :
+-12V to +-55V.
I imagine DC 25v is sufficient.
Denis
Will there be any distortions, do you need to make changes to the circuit? At this low voltage?
30w\4 or 15w\8
It is possible to use 1 pair of output transistors. Check bias, adjust if necessary.
It is possible to use 1 pair of output transistors. Check bias, adjust if necessary.
Last edited:
Attachments
If anyone is interested, I can post the schematic I used for the VU meters. It gets its signal from the speaker out-puts and there are pots to set-up for max VU when amp just starts to clip, looking at a scope sine wave. It runs completely from the speaker outputs.
The LED lights are fed from a 2 volt regulator.
The LED lights are fed from a 2 volt regulator.
I want to say that, VU meters looks pretty good like old times amplifiers. (I can't add vu meters on my amplifier. but, for knowledge base you can post here).
This preamplifier has no gain.
In my opinion, you can use potentiometer directly.
Operational amplifier with power supply. And there's no gain. It doesn't have to be used.
It may produce some noise. Anything with electricity has noise.😱
This voltage is very good. This is my favorite voltage.
Actually I don't like higher voltage.😀
I suggest you use it like this
No power is required.
A lot of times, we add something. Including money. It's possible to get the bad, not the good.
Here's a picture. Remove opa2134
Attachments
Last edited: