Val_r

vari-mu attack time
« on: July 15, 2005, 02:38:57 AM »
Wanted to know how it works the attack time setting of the UA 175A, and what I should mod to get slower attack times.

Thanks,
Val
Ok, cool ! Jahmekya


PRR

vari-mu attack time
« Reply #1 on: July 16, 2005, 03:40:12 AM »
> how it works the attack time setting of the UA 175A

schematic

Output signal is rectified in the 6AL5. The 0.1uFd capacitor is charged to a negative voltage, enough to reduce the gain of the 6BC8.

The 25K Attack pot slows the charging of the 0.1uFd cap.

> what I should mod to get slower attack times.

Change the Attack pot to 100K or 250K.

Or if you also want longer Release, chnage the 0.1uFd cap to 0.3 or 0.5uFd.


 

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