700M DC-Servo Mod
- Thread starter EchoWars
- Start date
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Closeup of the servo...
After install, offset remains below 0.3mV. Without it, offset sits at about 18mV.
The 700M is a good candidate, since it provides no offset adjustment. However, the way I've done this it is quite possible to add the servo to amps that do have an adjustment. The adjustment procedure would change slightly, but would pretty much never have to worry about adjusting it again.
After install, offset remains below 0.3mV. Without it, offset sits at about 18mV.
The 700M is a good candidate, since it provides no offset adjustment. However, the way I've done this it is quite possible to add the servo to amps that do have an adjustment. The adjustment procedure would change slightly, but would pretty much never have to worry about adjusting it again.
Very nice work EW, you are a true craftsman, I bet that thing sings like a bird when your done with it.
The electrolytics are Panasonic FC...the big 1.5µf input cap at the bottom right of the second pic is a Panasonic ECWF(B) metal polypropylene, and the caps used in the servo are Panasonic stacked metal film.
My intention is to have professional circuit boards made for this (and offer them as mods to amps I'm working on), rather than churn them out on full-line vero board like this. I figure that the size could be reduced by about 1/2.
My intention is to have professional circuit boards made for this (and offer them as mods to amps I'm working on), rather than churn them out on full-line vero board like this. I figure that the size could be reduced by about 1/2.
BlackSwamp
Previously DingusBoy
Did you ever get a mock up on the board?
Excellent work!
Excellent work!
Fixing that amp is where I found out how perfect the AD820/AD822 is for servo use.
Dunno. This digital camera sucks trying to shoot a pic of anything shiny. I'd have to take it outside in natural light to get it done. Might try it.
The guy that was gonna do it for me just got too busy and was in fear of losing his job, so I kinda got tired of dropping subtle hints to get it done. I'll have to bribe someone else.
