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 Forum index » DIY Hardware and Software » Rob Hordijk DIY Designs
Zeitgeist Schematics
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AlanP



Joined: Mar 11, 2014
Posts: 511
Location: New Zealand
Audio files: 31

PostPosted: Sun May 17, 2015 3:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Not at all, didn't answer since I'm not 100% on what's going on myself.
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Sun May 17, 2015 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

u mean out of body experiencies??
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lunaire



Joined: Jan 23, 2009
Posts: 19
Location: Sao Paulo

PostPosted: Mon Jun 01, 2015 7:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think this delay might be so good people dont want u to have it.. lol

Laughing

Im building one this week and wondering same things btw
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Thu Jul 16, 2015 12:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

inlifeindeath wrote:
PickNick wrote:
i'm still not sure what kind of regulator is 1702...
mcp1702?
can i use 7805?


yes, it's just a 5v line for the delay chip. 7805 work fine.

I'm not able to find any mcp1702..... so good to know that i can simply replace it with a 7805.....but do they have the same pinout??
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ym2612



Joined: Aug 03, 2015
Posts: 1
Location: USA

PostPosted: Mon Aug 03, 2015 9:19 am    Post subject: Reply with quote  Mark this post and the followings unread

So, I laid out my own Zeitgeist PCB from the schematic, and last night I finished building it into a stompbox. I really like the tape-like sound it gives, but one or more of the opamps on it seems to self-oscillate really easily. Has anybody else encountered this? I may have to pick over it with a scope and maybe add some more bypass caps.
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fluxmonkey



Joined: Jun 24, 2005
Posts: 707
Location: cleve

PostPosted: Mon Aug 03, 2015 9:36 am    Post subject: Reply with quote  Mark this post and the followings unread

tokyomatik wrote:
inlifeindeath wrote:
PickNick wrote:
i'm still not sure what kind of regulator is 1702...
mcp1702?
can i use 7805?


yes, it's just a 5v line for the delay chip. 7805 work fine.

I'm not able to find any mcp1702..... so good to know that i can simply replace it with a 7805.....but do they have the same pinout??


NO, different pinout (as i found from hard experience... released the majic smoke). i don't have the detail to hand, check the datasheet

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www.fluxmonkey.com
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gasboss775



Joined: Jan 02, 2016
Posts: 193
Location: Scotland

PostPosted: Thu May 18, 2017 6:32 am    Post subject: Reply with quote  Mark this post and the followings unread

tokyomatik wrote:
I'm checking the board with the components and I have some questions:
what are the pots function names?? (from left to right)


Late reply but in case you are still wondering:

From Left to Right ( P4, P3, P2, P1 )

Input Level, Wet/Dry mix, Modulation Depth ( from external CV ), Delay Time.

Quote:
The CV input is to control the delay time?


Yes

Quote:

what is SENSOR doing?(HDR 10)


It is an LDR, presumably to control delay time according to light level.

Quote:

what are the functions of JUMPER and the two HDR 3? jumpers for a different settings ?


HDR_3 allows you to bypass the external CV option the jumper allows you to bypass the LDR if you don't want to use it.

Quote:

the JUMPER next to the led says + and -, should I consider - as Ground??


Yes -Ve appears to be ground in this circuit. As it works from a single supply.

Quote:

I will try to etch this board in these days, not so many parts and looks also an easy build...any recomendation?


Can't say haven't built it yet, but will definitely breadboard it to try it out.
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