Adding pulsing LED to Hearthrob tremolo?

Started by bluesdevil, August 24, 2007, 08:01:29 PM

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bluesdevil

Just built up Markm's Hearthrob tremolo and love it (thanks alot)!!! I think it will replace my EA trem. Only thing missing is a pulsing status light. Where on the circuit board would I try tapping it in?
  **** Futurlec alert: I've been having a problem getting my last 3 builds to fire up properly. I fixed two when I realized the bag of resistors labeled "47K" by someone at Futurlec were actually 4.7K!!! This has happened before so I always measure first with the ol' DMM, but these must've slipped by me. Man, what a headache it caused.
    Now if I can get that Vibra-Tone working!!!
"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy

oldrocker

Is there a schematic anywhere for that too?

bluesdevil

It's a Schaller trem with a few different cap and resistor values, I believe.
Here's the Schaller schematic:
http://i17.photobucket.com/albums/b72/mmarkmm/SchallerTremoloA.jpg

I might also add a volume boost circuit at the end when I box it up.
"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy

markm

Quote from: bluesdevil on August 24, 2007, 08:01:29 PM
Just built up Markm's Hearthrob tremolo and love it (thanks alot)!!!

My Pleasure!!

Quote from: bluesdevil on August 24, 2007, 08:01:29 PM
I think it will replace my EA trem. Only thing missing is a pulsing status light. Where on the circuit board would I try tapping it in?

Place the cathode end at the collector of Q4 and the anode at ground.
This will give you the blinking LED.
To have the LED double as a status indicator as well, just attach the anode to the switch as normal. When engaged the LED will blink
when disengaged, the LED will be off.

Quote from: bluesdevil on August 24, 2007, 08:01:29 PM
Now if I can get that Vibra-Tone working!!!

That one can be a "bear" at times.
One question a day please!!  :icon_lol:
Next!?   ;D

bluesdevil

"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy

markm