burstmembrane
Member
- Joined
- Apr 26, 2018
- Messages
- 5
Hi, long time lurker on this forum, first time poster.
Today I acquired two Australian Monitor AMISPre-1 Mic amplifiers.
I opened them up and see they use one JRC4558 Op - Amp and two A733 PNP Amplifier Transistors, these are common parts and as it is a quite simple circuit I think I should be able to upgrade some components in the signal path to lower-noise components.
I have a couple of OPA2134s and 2N3906s and I am thinking of soldering in some sockets and trying out a few different combinations of opamp/transistor to see if I can lower the noise floor a bit.
Do you think its the active components or the capacitors in the signal path I should be focusing on the help minimize of noise?
It also has a 12v regulator in it but says the it should be run from a 12v supply?
From my understanding of voltage regulators you need a couple of extra volta above the output voltage to create a good output. Possibly that could be a big source of noise?
Any advice would be greatly appreciated!
Schematic link : https://drive.google.com/open?id=1K-x_fPtGbJwK2t4yzLULtuIP9wMN6sfN
Cheers
Liam
Today I acquired two Australian Monitor AMISPre-1 Mic amplifiers.
I opened them up and see they use one JRC4558 Op - Amp and two A733 PNP Amplifier Transistors, these are common parts and as it is a quite simple circuit I think I should be able to upgrade some components in the signal path to lower-noise components.
I have a couple of OPA2134s and 2N3906s and I am thinking of soldering in some sockets and trying out a few different combinations of opamp/transistor to see if I can lower the noise floor a bit.
Do you think its the active components or the capacitors in the signal path I should be focusing on the help minimize of noise?
It also has a 12v regulator in it but says the it should be run from a 12v supply?
From my understanding of voltage regulators you need a couple of extra volta above the output voltage to create a good output. Possibly that could be a big source of noise?
Any advice would be greatly appreciated!
Schematic link : https://drive.google.com/open?id=1K-x_fPtGbJwK2t4yzLULtuIP9wMN6sfN
Cheers
Liam