Search found 4 matches

by RickL
08 Feb 2011, 04:35
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Big Jam - SE-7 Delay Machine [schematic]
Replies: 0
Views: 1127

Big Jam - SE-7 Delay Machine [schematic]

Can someone explain to me the way the bypass works in this? I think the flip flop just turns Q5 on or off, adding or subtracting the wet signal. The dry signal is always present, although when the wet is bypassed the dry output should vary a bit depending on the position of the Balance pot. I have a...
by RickL
09 Nov 2010, 06:18
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Keio - Synthesizer Traveler [schematic]
Replies: 17
Views: 10451

Re: [SCHEM] Keio Synthesizer Traveler [schematic]

I couldn't wait so I built this. I used the values on the layout, not the schematic, subbed the transistors with other 2SC and 2SB units and guessed a bit on the wiring of the switches and pots. The fuzz works, the wah works, the bypass works, the Traveller works (seems to just be a passive volume c...
by RickL
18 Sep 2010, 05:07
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Keio - Synthesizer Traveler [schematic]
Replies: 17
Views: 10451

Re: [SCHEM] Keio Synthesizer Traveler [schematic]

I assume the posted PCB layout is the origional? If so, I see some differences between the schematic and the layout. 1) R13 (47k) and R14 (68k) are switched from the schematic to the layout. Which is correct? 2) R1 is 100k on the layout, 1M on the schematic. Which is correct? 3) R26 is 2k2 on the la...
by RickL
07 Jun 2009, 05:04
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - Heliotrope [traced]
Replies: 115
Views: 42951

Re: Catalinbread Heliotrope [guts+ schematic + PCB layout] [traced]

Trace missing from 100u cap. Should run under 47u to junction of 10k and 47R?

Rick