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DIY Stompboxes => Building your own stompbox => Topic started by: FWALS on May 23, 2011, 05:38:39 PM

Title: what does this schematic symbol mean?
Post by: FWALS on May 23, 2011, 05:38:39 PM
I'd like to build this, but I'm not sure what the  arrow with 'Vb' above it means.
Any help would be appreciated. Here's a link to the schematic

http://www.experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Analog%20Bit%20Crusher.gif



Title: Re: what does this schematic symbol mean?
Post by: cloudscapes on May 23, 2011, 05:44:41 PM
it's a voltage reference. in this case half of the power supply generated by the two resistors and capacitor on the left. just connect all 5 Vb points together and you're good to go.
Title: Re: what does this schematic symbol mean?
Post by: FWALS on May 23, 2011, 05:48:30 PM
Great thanks!
Title: Re: what does this schematic symbol mean?
Post by: ayayay! on May 24, 2011, 10:09:21 AM
Wow!  I don't think I've seen a pedal with so few grounds...  :icon_eek: That alone begs it to be built.  Should be really easy!  What the heck is this anyway?  Something synth-y?
Title: Re: what does this schematic symbol mean?
Post by: tiges_ tendres on May 24, 2011, 01:03:28 PM
Quote from: ayayay! on May 24, 2011, 10:09:21 AM
Wow!  I don't think I've seen a pedal with so few grounds...  :icon_eek: That alone begs it to be built.  Should be really easy!  What the heck is this anyway?  Something synth-y?
It's a sample rate reducer.  Kind of sounds like a ring mod.  I built one but was largely unimpressed.
Title: Re: what does this schematic symbol mean?
Post by: ayayay! on May 24, 2011, 02:25:15 PM
I'm a derp.  I don't know what a sample rate reducer is unless it's one of those online mortgage calculators. 
Title: Re: what does this schematic symbol mean?
Post by: Gurner on May 24, 2011, 03:19:39 PM
Quote from: ayayay! on May 24, 2011, 10:09:21 AM
Wow!  I don't think I've seen a pedal with so few grounds... 

They're there in spades... albeit virtual ones!
Title: Re: what does this schematic symbol mean?
Post by: tiges_ tendres on May 24, 2011, 03:23:38 PM
Quote from: ayayay! on May 24, 2011, 02:25:15 PM
I'm a derp.  I don't know what a sample rate reducer is unless it's one of those online mortgage calculators. 

Sounds like this:

Title: Re: what does this schematic symbol mean?
Post by: ayayay! on May 24, 2011, 03:34:06 PM
QuoteThey're there in spades... albeit virtual ones!

Oh yeah I know, I just mean the literal components to earth.  Don't see that too often in pedals. 
Title: Re: what does this schematic symbol mean?
Post by: EATyourGuitar on May 24, 2011, 03:40:08 PM
also fair to say that it can be called a sample&hold that goes up to audio rates. hence, therefor, hereto ::strokes beard:: why its a analog sample rate reducer and not the traditional analog>digital>analog converter with variable clock frequency.

(http://farm4.static.flickr.com/3434/5756049458_96ac56f345_t.jpg)
Title: Re: what does this schematic symbol mean?
Post by: FWALS on July 24, 2011, 09:27:05 PM
Quote from: tiges_ tendres on May 24, 2011, 01:03:28 PM
Quote from: ayayay! on May 24, 2011, 10:09:21 AM
Wow!  I don't think I've seen a pedal with so few grounds...  :icon_eek: That alone begs it to be built.  Should be really easy!  What the heck is this anyway?  Something synth-y?
It's a sample rate reducer.  Kind of sounds like a ring mod.  I built one but was largely unimpressed.

Hey what part did you use for the op amps?
Title: Re: what does this schematic symbol mean?
Post by: MikeH on July 25, 2011, 04:13:12 PM
Quote from: ayayay! on May 24, 2011, 03:34:06 PM
QuoteThey're there in spades... albeit virtual ones!

Oh yeah I know, I just mean the literal components to earth.  Don't see that too often in pedals. 

They dont show it on the schematic, but you'll obviously need to ground the opamps.  It's really not that different than other designs of similar complexity.
Title: Re: what does this schematic symbol mean?
Post by: tiges_ tendres on July 25, 2011, 04:32:57 PM
Quote from: FWALS on July 24, 2011, 09:27:05 PM
Quote from: tiges_ tendres on May 24, 2011, 01:03:28 PM
Quote from: ayayay! on May 24, 2011, 10:09:21 AM
Wow!  I don't think I've seen a pedal with so few grounds...  :icon_eek: That alone begs it to be built.  Should be really easy!  What the heck is this anyway?  Something synth-y?
It's a sample rate reducer.  Kind of sounds like a ring mod.  I built one but was largely unimpressed.

Hey what part did you use for the op amps?

2 4558's  Any dual will do.
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