Search found 309 matches

by Skreddy
09 Oct 2016, 02:20
Forum: Boutique Stompboxes dissected...
Topic: Mad Professor - Royal Blue Overdrive
Replies: 11
Views: 4589

Re: Mad Professor - Royal Blue Overdrive

Blah blah blah Where's the perfboard layout, Bjorn!?! :lol:
by Skreddy
14 Jan 2016, 19:41
Forum: Boutique Stompboxes dissected...
Topic: Fuchs The Royal Plush compressor
Replies: 6
Views: 2834

Re: Fuchs The Royal Plush compressor

You want to terminate the unused + input to 1/2 supply voltage and short its output to its - input. Of course there will already BE a virtual "ground" (1/2 supply) available you can just short the + input to; every op-amp circuit has one. This turns the unused amp into a low-impedance buffer for the...
by Skreddy
14 Jan 2016, 01:05
Forum: Boutique Stompboxes dissected...
Topic: Fuchs The Royal Plush compressor
Replies: 6
Views: 2834

Re: Fuchs The Royal Plush compressor

Do you think maybe one of the opamp channels might be driving too small of a load, causing them to burn out repeatedly?
by Skreddy
13 Jan 2016, 21:12
Forum: Boutique Stompboxes dissected...
Topic: Fuchs The Royal Plush compressor
Replies: 6
Views: 2834

Re: Fuchs The Royal Plush compressor

I personally wouldn't put black goop over the top of a socketed IC; I'd worry it might degrade the socket contacts. But I'm sure that's just me being picky.
by Skreddy
31 Mar 2015, 18:43
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

So basically the first one is for cable driving in bypass mode up to the next pedal or even the furthest amp, and the second one is to make sure that the cable driving is not affected by any effect input? I get your point Skreddy (and it's well explained! :thumbsup ), but I have to try your buffer ...
by Skreddy
31 Mar 2015, 18:02
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

Explaining the Cornish bypass buffer in pictures: Why the redundant buffer? (these portray the circuit when in bypass)

Image

Image
by Skreddy
31 Mar 2015, 15:49
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

Hi, In all respect, I give up. I don't think your technical arguments are valid. A 'filter' after 'just one' decent buffer instead of two cascaded decent buffers can not likely impart more 'tone suck' on the original source signal, unless a bizarre layout or some other unneeded non-technical influe...
by Skreddy
31 Mar 2015, 15:23
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

The input Z of the distortion circuit isn't just resistance to ground like the buffer's output stage; it's resistance to ground through an input cap, which would pull down the high end. The buffer at the input before the switch handles the input impedance for the whole circuit, and the buffer in fr...
by Skreddy
31 Mar 2015, 05:19
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

The input Z of the distortion circuit isn't just resistance to ground like the buffer's output stage; it's resistance to ground through an input cap, which would pull down the high end. The buffer at the input before the switch handles the input impedance for the whole circuit, and the buffer in fr...
by Skreddy
30 Mar 2015, 22:26
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

The redundant buffers are there because even with the buffered bypass, the input is still technically "sucking" tone unless its impedance is also raised with a buffer. That would indeed make sense if one was to address say 'second order' influences. But if I'm looking at the correct circuits, then:...
by Skreddy
27 Mar 2015, 20:54
Forum: Boutique Stompboxes dissected...
Topic: Cornish Bypass buffer [traced]
Replies: 68
Views: 28079

Re: Cornish Bypass buffer [traced]

The redundant buffers are there because even with the buffered bypass, the input is still technically "sucking" tone unless its impedance is also raised with a buffer.
by Skreddy
31 Oct 2014, 20:15
Forum: Boutique Stompboxes dissected...
Topic: Dunlop - Band of Gypsys Fuzz Face Mini FFM6
Replies: 17
Views: 11078

Re: Dunlop - Band of Gypsys Fuzz Face Mini FFM6

Is supposed to be an Octavia circuit but without the octave-up. I always hated that skronky sound from "Purple Haze," but it is unique at least.
by Skreddy
06 Oct 2014, 19:41
Forum: Boutique Stompboxes dissected...
Topic: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]
Replies: 401
Views: 74088

Re: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]

I use the standard 33k emitter resistor for Q1
Q2's bias is set thusly: an 820R to 9v, which is where I tap the output signal to the volume pot (and I use a .047uf cap to make a 100k pot sound the same as a .01 cap into a 500k pot) and a 1.8k resistor in series with a 10k bias pot.
by Skreddy
02 Oct 2014, 19:24
Forum: Boutique Stompboxes dissected...
Topic: Wampler SLOstortion [traced]
Replies: 180
Views: 42239

Re: Wampler SLOstortion [traced]

Gibson/Maestro patented the old Fuzz Tone. But holy shit; Fuller patented his Plimsoul??? On what basis??? What is unique about it? The same soft and hard clipping are both already found in the Nobels ODR-1, and I'm sure Nobels never thought there was anything novel about the idea either.
by Skreddy
25 Aug 2014, 19:24
Forum: Boutique Stompboxes dissected...
Topic: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]
Replies: 401
Views: 74088

Re: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]

...so I checked a few transistors in the big bag of BC183's on which I had previously written "<300 hfe". I don't know how that got on there; these things are all in the high 700's! Oh well. :scratch: Sorry for the false alarm.
by Skreddy
21 Aug 2014, 01:10
Forum: Boutique Stompboxes dissected...
Topic: Skreddy - P19 [traced]
Replies: 62
Views: 15926

Re: Skreddy - P19 [traced]

The resistors were ok - I dun goof'd with the resistor going from the sustain knob into the 2nd gain stage though. Used 82k instead of 8k2. Interesting possibility for a future build - use a very small resistor, maybe 10E, on the first and second gain stages and a 100k "Less" knob to cut down the a...
by Skreddy
20 Aug 2014, 05:01
Forum: Boutique Stompboxes dissected...
Topic: Skreddy - P19 [traced]
Replies: 62
Views: 15926

Re: Skreddy - P19 [traced]

Try using a 50k pot for the tone control instead of 100k. Less separation between high and low, so the middle ground is fuller. Thanks Marc, I did end up using a 50kB pot in the final build. I think I've screwed up somewhere else because the circuit works great as a very mild overdrive/boost, there...
by Skreddy
20 Aug 2014, 04:01
Forum: Boutique Stompboxes dissected...
Topic: Skreddy - P19 [traced]
Replies: 62
Views: 15926

Re: Skreddy - P19 [traced]

Try using a 50k pot for the tone control instead of 100k. Less separation between high and low, so the middle ground is fuller.
by Skreddy
16 Aug 2014, 04:35
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 10205

Re: Wyllie Moonrock [traced]

Not sure, could be, it's got the transformer. But, it looks like only one side of the transformer is in use as an inductor. It's got a lot of diode pairs. Here's my latest layout. A lot of the values are still missing and there's bound to be some errors still. I'm trying to put together a rough sch...
by Skreddy
16 Aug 2014, 02:08
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 10205

Re: Wyllie Moonrock [traced]

I'll presume it's some sort of Octavia type effect.