Search found 164 matches

by John Lyons
03 Jun 2014, 22:36
Forum: Boutique Stompboxes dissected...
Topic: Basic Audio - Scarab Deluxe [traced]
Replies: 75
Views: 29815

Re: REQ: Basic Audio Scarab Deluxe [traced]

Ok, I see it now. Paralleling the pot changes the taper as well.
Cheaper to use a 50KB pot rather than a 10KC...
The 10k resistor is only a couple cents. A 10KC pot is $1.50 or so.
by John Lyons
03 Jun 2014, 15:13
Forum: Boutique Stompboxes dissected...
Topic: Basic Audio - Scarab Deluxe [traced]
Replies: 75
Views: 29815

Re: REQ: Basic Audio Scarab Deluxe [traced]

~arph wrote:Why not replace the tone pot with a 10k and leave out R13? (or am I missing something? it's still early)
The 10k/.1/2k2 is the low pass filter. The 50k pot pans between a low pass and tone network bypass (for the most part)
Imagine the big muff tone network with only the low pass side.
by John Lyons
03 Jun 2014, 01:58
Forum: Boutique Stompboxes dissected...
Topic: Basic Audio - Scarab Deluxe [traced]
Replies: 75
Views: 29815

Re: REQ: Basic Audio Scarab Deluxe [traced]

1uf might be enough for you. The cap stores energy as well as passes signal at all frequencies.
I like the sloppiness of 10uf. My goal is to make it as tight and responsive with the .01 and then sloppy
with the 10uf. So you set the FAT knob as you like. 10uf has a good bit of thump to it...
by John Lyons
02 Jun 2014, 21:22
Forum: Boutique Stompboxes dissected...
Topic: Basic Audio - Scarab Deluxe [traced]
Replies: 75
Views: 29815

Re: REQ: Basic Audio Scarab Deluxe [traced]

I meant Q4, correct.
Remove C8, put R13 between C7 and ground.
R7 should be 100 ohms.
100 ohms between C5 and ground.
by John Lyons
02 Jun 2014, 02:03
Forum: Boutique Stompboxes dissected...
Topic: Basic Audio - Scarab Deluxe [traced]
Replies: 75
Views: 29815

Re: REQ: Basic Audio Scarab Deluxe [traced]

Fairly close. Remove R9 Remove the 750 in series with +9v Put 1k in series with the Bias Pot (25K) R5 is 1k C4 is 100uf FAT is 100k 1K off FUZZ pot is 750 ohms C7 is .1 Q3 emitter goes to .1 then to the high side of the tone pot. Split off the same .1 is 10k to the low side of the pot and a .1 to 2k...
by John Lyons
18 Sep 2013, 00:09
Forum: Boutique Stompboxes dissected...
Topic: Schumann PLL [traced]
Replies: 140
Views: 38681

Re: Schumann PLL [traced]

Not to stir the pot but I'd love to know what the Dimehead tweaks are. :wink:
Anyone figure it out?
by John Lyons
20 Apr 2013, 20:03
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Earth Sound Research - Graphic Fuzz [schematic]
Replies: 98
Views: 68339

Re: ESR graphic fuzz traced & layout [schematic]

Most of the talk is about the filter knob but check Paul's (PRR)
first post which is very close to your scheme, and my question as the initial post.
by John Lyons
20 Apr 2013, 16:07
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Earth Sound Research - Graphic Fuzz [schematic]
Replies: 98
Views: 68339

Re: ESR graphic fuzz traced & layout [schematic]

^ That seems like a way to do it. I think all the info about Jimmy's is there at DIystomp.
(Well at least very close to what he did at least)
by John Lyons
20 Apr 2013, 16:04
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: SMD Uni-Vibe
Replies: 29
Views: 9832

Re: SMD Uni-Vibe

Most impressive.
by John Lyons
18 Apr 2013, 23:05
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Earth Sound Research - Graphic Fuzz [schematic]
Replies: 98
Views: 68339

Re: ESR graphic fuzz traced & layout [schematic]

When you use a buffer before the circuit it will help with bringing back some high end
and stabilizing the circuit a bit. The oscillation is the fun part of the circuit.
There are a lot of big fuzz sounding circuits but this one has some weirdness
which is neat.
by John Lyons
18 Apr 2013, 12:37
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Earth Sound Research - Graphic Fuzz [schematic]
Replies: 98
Views: 68339

Re: ESR graphic fuzz traced & layout [schematic]

The Schematic has been verified for a year or more.
Granted the Schematic I posted was missing a ground and a 10k resistor. :oops: :lol:
by John Lyons
04 Mar 2013, 21:39
Forum: Boutique Stompboxes dissected...
Topic: D*A*M Grease Box [traced]
Replies: 35
Views: 8944

Re: D*A*M Grease Box [traced]

pamaz wrote:https://www.freestompboxes.org/viewtopic ... ilit=gb+83

20 seconds using the search function....
Easy cowboy, I did search and it didn't come up.
I found this thread though.
Must have only given it 15 seconds. :horsey:
Someone was kind enough to send me a link, thanks.

John
by John Lyons
04 Mar 2013, 03:24
Forum: Boutique Stompboxes dissected...
Topic: D*A*M Grease Box [traced]
Replies: 35
Views: 8944

Re: D*A*M Grease Box [traced]

I don't suppose anyone has had a peek at the GB-83 Silicon Grease Box have they?
by John Lyons
08 Oct 2012, 23:55
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: DeArmond - Twister ( Model 1930 Phaser )
Replies: 78
Views: 22385

Re: DeArmond - Twister ( Model 1930 Phaser )

Thanks! This ought to get me to get around to fixing mine. :applause:
by John Lyons
30 Aug 2012, 02:31
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Interfax - Harmonic Percolator [schematic]
Replies: 361
Views: 172346

Re: Interfax - Harmonic Percolator [schematic]

The Balance slider is a Level control.
Controls the balance of Level between bypassed and "on". :D
Just a little confusing but the order convention was to call it "balance"
It should not mix clean and distorted signals while the pedal is engaged.
by John Lyons
29 Aug 2012, 02:01
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Honey Special Fuzz [schematic]
Replies: 28
Views: 19501

Re: Honey Special Fuzz [schematic]

The octave/balance is fine when you match the transistors Hfe and use tight tolerance resistors to ground (22Ks). Some folks like to imbalance that section to get a little less octave so I guess it's up to you whether you want control over the octave or want it set strong. I don't think it warrants ...
by John Lyons
24 Aug 2012, 00:58
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Vorg - F-502 Warp Sound (Pearl F-602)
Replies: 22
Views: 13601

Re: Vorg - F-502 Warp Sound (Pearl F-602)

The 10k at the input can be 15K I've seen both...Not crucial at all.
I used something more than 27ohms at the freq pot. It just limits the frequency at the high end
so it's also not crucial, just sub in a 1k pot there are test to see what you like.
The 47k at the output is right.
by John Lyons
14 Aug 2012, 02:18
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: PUE Wah-Fuzz Beat Pedal
Replies: 7
Views: 4099

Re: PUE Wah-Fuzz Beat Pedal

The wah section sounds great.
by John Lyons
12 Aug 2012, 04:07
Forum: Boutique Stompboxes dissected...
Topic: Lovetone - Doppelganger [traced]
Replies: 154
Views: 28513

Re: Lovetone - Doppelganger [traced]

LaceSensor wrote:
John Lyons wrote:Very nice, thanks for making the comparison clip. :wink:
What do you think?
They sound pretty close. Nothing stood out as being
"off" about the copy you made. Are you going to sell the original? :lol:
by John Lyons
11 Aug 2012, 17:01
Forum: Boutique Stompboxes dissected...
Topic: Lovetone - Doppelganger [traced]
Replies: 154
Views: 28513

Re: Lovetone - Doppelganger [traced]

Very nice, thanks for making the comparison clip. :wink: