Schaller Tremolo schematics!

[Carlos]

BTW transistors are BC549B.

Carlos

[JHS]

The build-quality of the new units is at lest 10 times better compared to my '70 version (looked like a beginners DIY-hack).

The FX is not true bypass, it's allways on w tremolo effect or w/o. I never use the tremolo effect, I set the amplitude to zero with effect on. Output volume and mids are slightly boosted and I use it as mid booster for the Strat/Marshall combination.
The tone is dynamic and Vol-pot reaction is good, similar to a tube booster.

JHS

[Zero the hero]

Tonight I'm going to have a closer look to the LFO shape and how it appears on a scope.
I used a BC550 as the audio transistor (Q2 in my layout) and BC548 for the other 3 trannies. No tantalum caps, just plain electros.
I think that some component ratings vary from your stock unit to the schem you provided: there are 3 6k8 resistors opposed to only one of my unit.
There is no remarkable hiss or noise and the tremolo is deep enough for my taste. Maybe the depth pot should be linear since the control has influence only in the first half of the turn (it's a fault of mine: I had only log pot at home yesterday).
What comes next? I have to packet it with true bypass, in order to see how much this circuit influences the tone / volume of the guitar.
JHS, so you use it just as a booster?
Carlos, I'll do a PCB for you, but I'll be away from home till Saturday.

[Zero the hero]

And thanks for the pics! 

[Carlos]

Thanks zero for the PCB! I love DIY and this forum in particular!
Zero, you've got a personal message
Carlos

[TELEFUNKON]

Hi everybody, hi Zero the Hero,
the Schaller tremolo I ordered some time ago has just arrived. The build quality, however, is dismal, so that I will send it back and get a refund. It's a plastic box covered with graphite lacquer from the inside.
In the meantime I took a few pictures. Zero the Hero, if your layout is okay and you make a PCB, would you mind making a PCB for me, too? I'll verify the schematics.
Have fun
Carlos

PEDALS FOR NOTHING - REVENGE FOR FREE !

What an attitude: "Say It Loud: I Clone & I`m Proud"

[Carlos]

Telefunkon,

my first pedal looked better than the Schaller tremolo I took the pictures of. Just look at the soldering!
BTW the speed didn't seem to have a function on the commercial tremolo I just sent back.
It's a shame that Schaller doesn't check the quality, it's such a good design.
I guess you're right: time to clone!

Carlos

[gez]

Er, or just rehouse and rectify the problems with the sloppy soldering etc...hell of a lot easier/cheaper.

[TELEFUNKON]

it`s a miserable design compared to nowadays knowledge of circuit design,
(to those practised in the arts...)
and the build-quality of the product is known since almost 40 years.

right: time to learn!

[gez]

it`s a miserable design compared to nowadays knowledge of circuit design,

Granted, but it does seem a little perverse spending money cloning the thing when it could have been 'made right'.

[TELEFUNKON]

I want to learn all about the circuit;
e.g.: what`s that :

"Nachdruck verboten" note in the original schematic diagram?

a secret mod?

[skumbeg]

I want to learn all about the circuit;
e.g.: what`s that :

"Nachdruck verboten" note in the original schematic diagram?

a secret mod?

A secret do not copy mod perhaps?

[Namenlos]

Hello,
it's simple, the translation is: "reprinting is forbidden". Hopefuly it's grammatically correct.

greets
Henning