Origins of MELCOR DOA

[owel]

People always seem to refer to the Melcor discreate op-amp as "Peter C's Melcor."

Is this circuit designed by Peter C? or is Melcor is/was/used to be a real audio company? Is there a real Melcor discrete opamp product?

I'm just curious. Thanks.

 

[Ethan]

Melcor was an actual company. The Melcor opamp (and mic preamp etc.) was made by Melcor Audio Products.

 

[Kev]

yep,
... and the unit we talk of is the Melcor 1731.

A google search for diy descrete opamps found :

http://recording.org/users/kev/discrete_op-amps.htm

:wink:

 

[peterc]

I just designed a PCB for the Melcor 1731 cct that is compatible with the A-P-I 2-5-2-0.

Peter

 

[owel]

Thanks for the answers....

I finally populated my Melcor PCBs and tested it. These are the numbers I'm getting:

Power Supply voltage: +/- 18V
Max output Voltage before signs of clipping: 12.007 Vrms (+23dBu)

Is this on par with the other's results?

What's the max supply voltage of the Melcor DOA?

 

[CJ]

crank it up til it gets hot , then back down a few degrees.
mine says +-15vdc, so i would not go much higher than 18

 

[owel]

It's still cool at +/-18V. The transistors Vce are rated at 40V max, so I think this is a safe stopping point. +/- 18 is about 36V from (+) rail to (-) rail.

 

[PRR]

> Power Supply voltage: +/- 18V; Max output Voltage before signs of clipping: 12.007 Vrms (+23dBu); Is this on par with the other's results?

Dunno about others, but you are not going to do any better. 12.007Vsine * √2 = 16.980V peak. Supply voltage is 18V. 18-16.98= 1.02V loss from theoretical. Or if you could reach theoretical zero-loss for 18V supply, you would get 0.5dB higher output. Insignificant.