spud wrote:
I have a blurry, useless, inaccurate paper copy from something called
analogman. If someone has a real copy with component values I'd really
appreciate it if you could contact me at the below address. I think
it's pretty similar to the Electro Harmonics PS-1. Thank you, s.
mrmasondjp
at
yahoo.com

Most schematics available on the web for this or the Mutron III envelope
filter are NOT going to be as easily readable as from something built in
the last couple of years. Got to remember these units were done before
CAD systems were generally available and were hand drawn. Analog Mike is
doing the best he can with what he's got. He's not a 'thing' but a real
person.
What kind of parts are you looking to replace? The op amps are/were
standard Motorola old ones, circa mid 1970's. If you can read the color
codes on the resistors (they were standard carbon resistors), that will
help. I never kept the schematic in my head, but could probably trace it
out if I had the unit in my hands. Oh yeah - don't try and put in a new,
super-duper spec'd op amp - the extended frequency response won't help
any, and may well cause more problems than it'll help.
Spray some contact cleaner into thew pots and controls - that will help
take care of intermittents that way.
How do I know such - used to work for the company when they were in
Rosemont, NJ doing final test and checkout along with repair of customer
returned units. My test equipment (besides DVM and scope)? A Strat and
Twin Reverb.
--
de Jack N2MPU FN20
Modeling the NYC/NYNH&H in HO and CP Rail/D&H in N
Proud NRA Life Member

Sorry I haven't gotten back to you sooner but I've been sick. Funny that
you mention Hamamatsu as the maker for the opto - I work for the company
here in the US. Have looked around, and they don't make that part anymore.

As I said in a previous post, don't knock Analog Mike. He's doing the
best with what he's got. He's as good as can be found on the net for
supplying effects. Schematics are NOT his primary business. No One, save
for maybe Aaron Newman or Mike Beigel would have a first generation copy
of the schematic, and even then they might not share it with the general
public.

The oscillator is free-running, so you shouldn't have ANY delay in the
effect sounding. Do you keep the unit engaged, or are you constantly
switching the unit in and out of the circuit via the foot switch? If
that's what you're doing then what you're doing is wrong.

Don't even bother taking out the op amps from the Radio Shack piece, or
any other piece of electronics. More likely than not you'll ruin the op
amp with excess heat or static discharge. Most parts can be harmed with
10 volts of ESD, and the average person without a ground strap carried a
charge in the 4 to 5 figure voltage range.

Instead of taking up bandwidth on the group, email me from a legitimate
email address (due to viruses I don't deal with Yahoo email addresses)
and we'll go from there. If you can't or won't do that, than I see no
point in helping you, especially seeing as this would have been better
brought up in alt.guitar.effects and not rec.audio.pro
--
de Jack N2MPU FN20
Modeling the NYC/NYNH&H in HO and CP Rail/D&H in N
Proud NRA Life Member