untune
Well-known member
Hello all,
A little sideline topic related to my preamp project. A few weeks ago I managed to get hold of an old Sifam Peak Signal Level meter with the intention of eventually replacing a broken VU meter with it. The one I've got looks a lot like the type that were used on old Ferrograph series 2 machines - as some may know, these meters are 'backwards'. It's 1mA FSD (tested it and it's pretty linear) but the needle rests on the '10' and moves towards the '0' as input gets closer to 1mA.
I assume there's circuitry involved to drive it (ECC82 comes to mind from a Ferrograph schematic) but I was wondering if it would be possible to utilise it so that it rests at 0 and responds to an audio signal to give an indication of the signal. I don't need this to be accurate to any degree, I just need to see a visual representation of the sound that I can calibrate to give me an idea of where the signal might clip. I have a Ferrograph recorder that uses a very similar meter, which sits at 0 (adjustable) when powered up but returns to 10 when powered off.
If it's going to be a difficult job I might be better looking for something else!
Cheers
A little sideline topic related to my preamp project. A few weeks ago I managed to get hold of an old Sifam Peak Signal Level meter with the intention of eventually replacing a broken VU meter with it. The one I've got looks a lot like the type that were used on old Ferrograph series 2 machines - as some may know, these meters are 'backwards'. It's 1mA FSD (tested it and it's pretty linear) but the needle rests on the '10' and moves towards the '0' as input gets closer to 1mA.
I assume there's circuitry involved to drive it (ECC82 comes to mind from a Ferrograph schematic) but I was wondering if it would be possible to utilise it so that it rests at 0 and responds to an audio signal to give an indication of the signal. I don't need this to be accurate to any degree, I just need to see a visual representation of the sound that I can calibrate to give me an idea of where the signal might clip. I have a Ferrograph recorder that uses a very similar meter, which sits at 0 (adjustable) when powered up but returns to 10 when powered off.
If it's going to be a difficult job I might be better looking for something else!
Cheers