Systech - Overdrive

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: Systech - Overdrive

Postby Dr Tony Balls » 03 Jun 2011, 03:17

RnFR wrote:Q2 looks a bit off.



In what way? I know the line connections on the drawing are shit.
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Re: Systech - Overdrive

Postby Mr. Bill » 03 Jun 2011, 17:26

I would expect that R16 would connect directly to the power supply, not through R15. I haven't had a chance to download the photos to check this though.
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Re: Systech - Overdrive

Postby grizzlytone » 05 Jun 2011, 09:30

grizzlytone wrote:Thanks for the info!

I think the purpose of the of the power supply circuit is to have a soft start powerup, the voltage ramps up while C13 is being charged through a resistor -gives a thumpfree input jack plug-in...

What is the serial # of the unit? Is the Zip code 49001 or 49006?

...I love Jerusalem too
/M


In case you don't get it; The reason I'm asking for the serial number is because I'd like to try to put it on a timeline (not for some stupid reason like trying to claim ownership...). The reason that I'm asking for the Zip code (on the back of the pedal that is -not your zip code) is for the same purpose. The reference to Jerusalem is because your avatar is taken from the cover of the great Sleep (...High On Fire...Matt Pike....) album "Jerusalem" witch contains just one song 52 minutes long....
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Re: Systech - Overdrive

Postby Dr Tony Balls » 29 Jul 2011, 17:37

For anyone's info, both this schematic and this vero layout are verified. The layout is probably pretty poor as it's tight in some places and loos in others, but hey...it worked!

Image

Image
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Re: Systech - Overdrive

Postby Mr. Bill » 29 Jul 2011, 22:52

I did not look at the vero board layout, maybe you've corrected it there, but there are at least two errors in the schematic. R16 should connect directly to the +V buss and R4 should connect pin 5 to the +V/2 supply not pin 3. Pin 3 connects directly to the +V/2 bias supply.
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Re: Systech - Overdrive

Postby Dr Tony Balls » 05 Aug 2011, 17:56

Thanks! You're completely right, although as built it sounded close enough the original. Maybe I should A/B them again. Corrected Schem and Vero are here:

Image

Image


Maybe i'll get a sound clip up at some point.

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Re: Systech - Overdrive

Postby D-Day » 07 Sep 2011, 06:40

Thank you Doctor! A friend has the Harmonic Energizer and it's busted. I'm building him a clone on a Madbean board. He's a recording engineer for the last twenty years and after using his HE on most sessions involving any kind of rock guitar, became quite the Systech fan. Next, I'm going to build him this for Christmas and I couldn't have done it without your hard work here. It's going to be great! He knows these things exist but has never seen/heard one :thumbsup
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Re: Systech - Overdrive

Postby Dr Tony Balls » 07 Sep 2011, 12:41

No problem! I got excited when something crossed my path that was completely absent from this board. A good opportunity to contribute!
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Re: Systech - Overdrive

Postby kaycee » 08 Sep 2011, 09:25

Thanks for that! Having built the Harmonic Energiser from Sabro's layout I'm interested in this one. Added to the to do list :)
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Re: Systech - Overdrive

Postby PlutoniumBob » 22 Sep 2011, 15:49

Anyone have a clue as to where I can get hold of one of these excellent extruded aluminium cases?
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Re: Systech - Overdrive

Postby agoldoor » 07 Jan 2012, 20:04

How exactly does one wire buffered in/output, say for this layout? How does one wire the switch/jacks, where does it all go?
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Re: Systech - Overdrive

Postby johnk » 06 Jul 2017, 10:37

zombie thread alert.
i still have my original Systech OD that i bought in the 70's (and it still works perfectly). here's a pic of it:
Image

i drew up a PCB & built a clone of it today and it sounds like the original:
01-systech OD Layout corrected.jpg
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Re: Systech - Overdrive

Postby Dirk_Hendrik » 08 Jul 2017, 08:53

Nice!!
Sorry. Plain out of planes.

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