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Keio - Synthesizer Traveler  [schematic]

PostPosted: 07 Aug 2010, 14:21
by Dirk_Hendrik
For this one I've had many requests, sorry for the long delay Boris) and since I'm off next week here's something to chew on.

Which one was that again? This one, the pedal aiming for the title "biggest off em all"
http://www.dirk-hendrik.com/images/keio.jpg
and http://www.dirk-hendrik.com/images/keio_inside.jpg

I'll post the PCB layout next week, including component placement. Here's the schem for a warmup:
http://www.dirk-hendrik.com/temp/keio_synthesizer_traveler.pdf

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 07 Aug 2010, 16:34
by borislavgajic
sorry for the long delay Boris
........no man ..I am sorry if I was pushing too much :lol: year after year :D :oops:
Thank you Mr Dirk for your time and effort :thumbsup :hug:

Boris

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 07 Aug 2010, 18:09
by Dirk_Hendrik
Thanks laddie. Knew I could count on you :hug:

Other than that, I had to. The thing is really acting up weird. Poor contacts, cracking wiring, name em. Drawing up a schem is step one in a full overhaul.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 08 Aug 2010, 00:34
by John Lyons
Are there any recorded examples I can check out?

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 08 Aug 2010, 04:37
by celadine
Thanks Dirk! Thats a weird one, especially the wah/singing. No wonder they called it 'synthesizer', its like 8 pedals in one.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 31 Aug 2010, 16:49
by gigelmargel
Very interesting project, Dirk! Thanks a lot for it!
I will give it a try as soon as you will post the PCB...:)

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 02 Sep 2010, 23:17
by Dan N
Thanks very much, Dirk!

Hmmm, guess it's so rare no body has even demoed one on youtube. The Jacques "Singing Geisha" is supposed to be a clone, but can't find a sample of one of those either.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 09 Sep 2010, 21:26
by Dirk_Hendrik
oops..made a promise

keio_pcb.gif

keio_pcb_silk_values.gif

red components are added on the pcb solder side.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 09 Sep 2010, 22:04
by gigelmargel
Very kind, as usually, Dirk!
Thank you very very much :)

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 10 Sep 2010, 09:03
by borislavgajic
:applause: :hug:

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 11 Sep 2010, 18:17
by SPeter
Thanks!
:applause:
:thumbsup
:D

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 12 Sep 2010, 18:15
by noelgrassy
Nice job Dirk, thank you! I've never seen or much less heard one of the puppies so it'll
be a fun project to put one together. Does anyone see obsolete parts that may make
the BOM a bitch to fill?

Why "Traveler" I wonder? Or am I confusing a sojourner [i.e. Kwai Chang Kane] with the treadle action? :hmmm:

Noel Grassy.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 13 Sep 2010, 01:37
by John Lyons
Image

Yeah, interested to hear this one.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 18 Sep 2010, 06:07
by RickL
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 layout, 47k on the schematic. Which is correct?

4) Pads 4 and 6 (counting from the left on the layout) are not connected on the layout, they are on the schematic. Are the the two points connected with a wire on the actual unit?

I'm ready to build this as soon as I know the correct values. I'll assume that generic NPN and PNP transistors will work as long as the pins are connected correctly.

Rick

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 18 Sep 2010, 09:18
by Dirk_Hendrik
RickL wrote: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 layout, 47k on the schematic. Which is correct?

4) Pads 4 and 6 (counting from the left on the layout) are not connected on the layout, they are on the schematic. Are the the two points connected with a wire on the actual unit?

I'm ready to build this as soon as I know the correct values. I'll assume that generic NPN and PNP transistors will work as long as the pins are connected correctly.

Rick


Thanks for the attention.
I'll check later. Gotta buy a house first.

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 19 Sep 2010, 12:44
by borislavgajic
Thanks for the attention.
I'll check later. Gotta buy a house first.


hey Dirk.....your place got too small for all pedals you have? :thumbsup :lol:

happy housing !

Boris

Re: [SCHEM] Keio Synthesizer Traveler

PostPosted: 09 Nov 2010, 07:18
by RickL
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 control that operates when the fuzz is bypassed) but the singing does nothing.

Operating the Singing switch just seems to switch the wah in and out. Neither the Peak nor Singing pots have any effect in either position of the Singing switch. R19 (trimmer) affects the resonance of the wah.

I've experimented a bit with the wiring of the wah pot and the Singing switch with no luck.

Anyone have any ideas?

Re: Keio - Synthesizer Traveler

PostPosted: 11 Apr 2017, 14:15
by modman
found some pictures and gut shots