Search found 67 matches

by grizzlytone
17 Feb 2019, 16:02
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Sekova - Fuzz ( FA-II , Apollo , Crestwood ) [schematic]
Replies: 46
Views: 28387

Re: Sekova - Fuzz ( FA-II , Apollo , Crestwood ) [schematic]

I'm guessing the big one labeled 224m50 is 224nf 50v, so i should look for .22uf. open to suggestions as to what type. and if anyone has a guess on the other two. i've done recapping before but never on a guitar pedal. according to the diagram posted above, the little green fuzzy one would be C10, ...
by grizzlytone
06 Feb 2019, 09:06
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Conn Multi-vider (Silverbox)
Replies: 21
Views: 9215

Re: Conn Multi-vider (Silverbox)

pinkjimiphoton wrote:if one of you gents could kindly repost the hand drawn schematics, i'd be very grateful!
thanks!
Here's a new link to my schematic:

https://www.dropbox.com/s/thws29s1z0zbp ... t.pdf?dl=0

/M
by grizzlytone
01 Mar 2018, 07:38
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Conn Multi-vider (Silverbox)
Replies: 21
Views: 9215

Re: Conn Multi-vider (Silverbox)

Here's a link to my homedrawn schematic and my notes regarding the soprano circuit. There's no clipping stage. I had some trouble with the soprano circuit as well when trying to use it as a guitar effect. Apparently I worked at balancing the soprano circuit frequency doubler (which is what it reall...
by grizzlytone
28 Feb 2018, 22:36
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Conn Multi-vider (Silverbox)
Replies: 21
Views: 9215

Re: Conn Multi-vider (Silverbox)

Also, the input impedance is extremely low, only 1,5 kilohm, killing even more of the already weak signal from a passive guitar pickup. The input impedance is in fact typical for mic preamp inputs, designed for standard professional microphone source impedance 50 or 200 ohms. If you were to plug you...
by grizzlytone
28 Feb 2018, 13:08
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Conn Multi-vider (Silverbox)
Replies: 21
Views: 9215

Re: Conn Multi-vider (Silverbox)

Here's a link to my homedrawn schematic and my notes regarding the soprano circuit. There's no clipping stage. I had some trouble with the soprano circuit as well when trying to use it as a guitar effect. Apparently I worked at balancing the soprano circuit frequency doubler (which is what it really...
by grizzlytone
07 Feb 2016, 10:00
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pefftronics - SB-101 Rand-O-Matic [schematic]
Replies: 18
Views: 14183

Re: Pefftronics SB-101 Rand-O-Matic [schematic]

Alrighty then... I've traced, traced, and double traced, and this is what I have to date (click on images to get larger images from Photobucket); [ Image ] And, the schematic that Andy has developed from it (ignore the rotary switch LED's, that's a possible add-on); [ Image ] I have this monster on...
by grizzlytone
14 Sep 2014, 21:02
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pearl - OD-05 ( Overdrive ) [schematic]
Replies: 23
Views: 11983

Re: Pearl - OD-05 ( Overdrive ) [schematic]

OK. So you have a 2,1V voltage drop across a 220 ohm resistor. Since all return current passes through this one resistor one can now calculate the total current draw as I = U/R = 2,1/220 = 9,55 mA. Seems reasonable currentwise (does it match specs?) but I can't see the benefit in lowering the V+ sup...
by grizzlytone
14 Sep 2014, 14:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pearl - OD-05 ( Overdrive ) [schematic]
Replies: 23
Views: 11983

Re: Pearl - OD-05 ( Overdrive ) [schematic]

…and Yes, you can swap R28 and D2 for say two 10k resistors -then the op amp bias would always be V+/2 (for better headroom) whatever the supply voltage. I think the practice of using a zener in that position in the whole pedal line comes from the necessity of using a zener in that position in the F...
by grizzlytone
14 Sep 2014, 13:52
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Pearl - OD-05 ( Overdrive ) [schematic]
Replies: 23
Views: 11983

Re: Pearl - OD-05 ( Overdrive ) [schematic]

Green band = 5 Brown band = 1 I'd say it is a 5V1 zener. But like Dirk says, best way to be 100% certain would be to measure the voltage drop across the zener when it's back in circuit and powered up (keep in mind that actual voltage drop varies both with current and component tolerance if you happe...
by grizzlytone
23 Aug 2013, 19:24
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Systech - Harmonic Energizer [schematic]
Replies: 177
Views: 92192

Re: Systech - Harmonic Energizer [schematic]

Got this on the breadboard at the moment, sounds good. I used a 2N5457 for the input buffer which works fine, and didn't bother with any of the power related circuitry other than the 10k/10k/10uF volateg divider. I've also got a switch that puts either one or two pairs of antiparallel 1N4148s acros...
by grizzlytone
22 Aug 2013, 20:50
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

On the "Muff-sized" version, I just noticed the switch is on the back, between the jacks. btw grizzly, do you have any part values for the layout/schematic you posted?? 8) Nope, like I say in the post, I have only ever seen the drawing of the PCB solder side mentioned in the post (and lat...
by grizzlytone
22 Aug 2013, 17:38
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

I haven't seen the blob in question. From the pictures that I've seen all three versions used two 9V batteries but it is possible that some of the SS-1's presented on eBay has been upgraded or modified I guess (SS-1 cover and SS-2 innards?). Here's pics of the three versions, notice same version bl...
by grizzlytone
21 Aug 2013, 21:10
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

Not much more to go. The ICs are Fairchild U6A7757393. Couldn't find any info on the interwebs on those. The transistors are 2N5133 and 2N3565. Update: one IC is a U6A7757393. The other is a U6A7723393, which seems to be a 723 voltage regulator. Since it's a U6A7 723 393, I thought the other might ...
by grizzlytone
21 Aug 2013, 07:17
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - USS-1 [schematic]
Replies: 35
Views: 18357

Re: Maestro - USS-1 [schematic]

Thank you very much grizzlytone for the documentation you have provided. That helps to figure out the proper switching scheme for the footswitch wiring. Here is the updated factory schematic I have come up with. It is all one one page now: Thanks Cortez. If you compare my schematic to the factory s...
by grizzlytone
20 Aug 2013, 20:58
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

Yeh, grizzly, that's what I thought too (layout vs schematic). strangly, I thought I've seen that schemo before. gonna search my compressor archives. hey, thanks for those "blob" pics!!!! The first blob looks like it's in a Muff chassis(?) I see 2 9Vers in the 2nd pic. I make out 2 9V con...
by grizzlytone
20 Aug 2013, 20:12
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

Effectsiation wrote:Have you guys seen this?
[ Image ]

Obviously AnalogGuru has since it's hosted on his site, but I wanted to post it here in case it helps the conversation.
Yep. That's the one PCB layout I was refering to in my post with the guesswork schematic. Thanks for the clarification.
by grizzlytone
20 Aug 2013, 20:06
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - The Sustainer [schematic]
Replies: 34
Views: 12565

Re: Maestro - The Sustainer [schematic]

grizzly, that blob that Ron has looks like only 1 9V connector :hmmm: He also said it was in the same box as the ebay unit. T I didn't get the box with the block so I may be wrong on that. I haven't seen the blob in question. From the pictures that I've seen all three versions used two 9V batteries...
by grizzlytone
20 Aug 2013, 19:09
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - USS-1 [schematic]
Replies: 35
Views: 18357

Re: Maestro - USS-1 [schematic]

Sheet #2.

That's it. Peace out brothers & sisters.
by grizzlytone
20 Aug 2013, 19:06
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - USS-1 [schematic]
Replies: 35
Views: 18357

Re: Maestro - USS-1 [schematic]

Sheet #1...
by grizzlytone
20 Aug 2013, 19:04
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - USS-1 [schematic]
Replies: 35
Views: 18357

Re: Maestro - USS-1 [schematic]

Interaction and trimmers...