Maestro FSH-1 / Oberheim VCF / Tonepad Filter/Sample/Hold

chicago_mike · Post by **chicago_mike** » 29 May 2012, 15:44

So somehow i used a 5 ohm resistor instead of a 1 meg in one area.

I'm rewiring both my FSH's with color coded ribbon wire. ...hopefully to keep the rats nest look down.

So, I think my pedals should be good now. Found some 2N5457's locally too.

grrrunge · Post by **grrrunge** » 29 May 2012, 17:11

chicago_mike wrote:So somehow i used a 5 ohm resistor instead of a 1 meg in one area.

I'm rewiring both my FSH's with color coded ribbon wire. ...hopefully to keep the rats nest look down.

So, I think my pedals should be good now. Found some 2N5457's locally too.

Fingers crossed

It's an awesome pedal!

chicago_mike · Post by **chicago_mike** » 29 May 2012, 20:09

thanks!!

I put some "mojo" parts in my juggernaut clone just now and I think I'm ready to finish my fsh's.

I'd atempt at putting "mojo" parts in my fsh..but I just know my house would explode...

agoldoor · Post by **agoldoor** » 01 Jun 2012, 18:40

When is someone going to dare creating a vero layout for this pup? THAT would be cool.... *hint hint*

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 19:09

This??

agoldoor · Post by **agoldoor** » 01 Jun 2012, 19:13

Well... a vero layout of that, yeah =)

chicago_mike · Post by **chicago_mike** » 01 Jun 2012, 19:24

Haven't seen one.

grrrunge · Post by **grrrunge** » 02 Jun 2012, 11:20

agoldoor wrote:When is someone going to dare creating a vero layout for this pup? THAT would be cool.... *hint hint*

HBO made one. It's here: http://www.sabrotone.com/?p=488

chicago_mike · Post by **chicago_mike** » 02 Jun 2012, 15:48

who the hell is crazy enough to vero board this thing??!!!??

People have enough trouble with the pcb version as is!

agoldoor · Post by **agoldoor** » 03 Jun 2012, 06:00

Ho-lee shit, so he did... missed hat one. Leave it to Harald! Thanks!

chicago_mike · Post by **chicago_mike** » 06 Jun 2012, 19:18

hey Grrunge...

How did you hook up your grounds?

Also..I am getting it to almost work. I get I think the down sweep? The thinner sounding sweep. The other direction has just a low bass output..no sweep.

And the sample/hold..I need to readjust the trimmers...It WAS working before..

The only parts swap I have really done was the .15uf caps. I don;t have those, but I have.1 and .22 .

And I'm going between mpf102 and 2N5457's.

grrrunge · Post by **grrrunge** » 06 Jun 2012, 20:34

chicago_mike wrote:hey Grrunge...

How did you hook up your grounds?

input- and output grounds directly to chassis, and supply ground to input sleeve lug.

chicago_mike wrote:Also..I am getting it to almost work. I get I think the down sweep? The thinner sounding sweep. The other direction has just a low bass output..no sweep.

Try turning the range knob, as i wrote a few posts back:

grrrunge wrote:...The range setting that makes awesome swooshing sounds on the up setting, makes almost no sound on the down setting and vice versa.

chicago_mike · Post by **chicago_mike** » 06 Jun 2012, 22:08

Yeah, I move that range pot all over. I swapped it out and will try again. =)

I am using an active bass, But I have yet to measure the pp voltage output....but, I dont think it should matter???

Anyhoo, I'll get them to go.

chicago_mike · Post by **chicago_mike** » 06 Jun 2012, 22:10

Oh and speaking of grounds...

I got these copper ..forgot that they are called..

But they're like a real skinny pcb. I can use those as a star ground.

grrrunge · Post by **grrrunge** » 07 Jun 2012, 04:14

chicago_mike wrote:Oh and speaking of grounds...

I got these copper ..forgot that they are called..

But they're like a real skinny pcb. I can use those as a star ground.

Star ground? How many ground wires do you have?

chicago_mike · Post by **chicago_mike** » 07 Jun 2012, 18:43

9 volt ground

input and output ground

board ground

led ground

I don't want to create a ground loop.

I wonder if my 13700 is bad..since I'm just not getting sweep in one of the positions. All other wiring is good and tidy. All parts are correct except the .15's which I used .22 and .1..I don;t have .15's small enough.

grrrunge · Post by **grrrunge** » 07 Jun 2012, 19:31

If it sweeps one way but not the other, check the up/down switch wiring and the surrounding components.
It doesn't sound like a bad OTA to me...

chicago_mike · Post by **chicago_mike** » 07 Jun 2012, 19:47

coolness. I double triple dipple check.

rrroo · Post by **rrroo** » 12 Jun 2012, 11:39

has anybody else had problems with the gain of the circuit? mine is very weak. are there any ideas to improve the gain or do i have to add a booster in front. Also what would i have to tweak to make the LFO go faster? I really can't find any use for the very slow sample&hold..

chicago_mike · Post by **chicago_mike** » 12 Jun 2012, 20:44

for gain I think you could try increasing or decreasing the input and output cap values.

For more S&H Speed....hmm..thats a puzzler.

Maestro FSH-1 / Oberheim VCF / Tonepad Filter/Sample/Hold [schematic]