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DIY Stompboxes => Building your own stompbox => Topic started by: mattpocket on June 29, 2007, 08:01:57 AM

Title: My Random Number Generator Layout
Post by: mattpocket on June 29, 2007, 08:01:57 AM
(http://i10.photobucket.com/albums/a113/midfielectronics/rngorig.jpg)

(http://i18.photobucket.com/albums/b132/ukuleleboy/render.gif)

The fact that the tranny legs for Q3 and Q4 are bent means the layout can be more compact. And could go even smaller. I just spread it out a bit for now. Of course you could put the trannys in straight if you were going to use a feedback pot, rather than a resistor, but my layout allows for both. Whether its correct or not is a different matter.

Can anyone check it for me? I know a couple of people were interested in a layout for this!?

Thanks

Matt

Title: Re: My Random Number Generator Layout
Post by: ambulancevoice on June 29, 2007, 08:30:33 AM
what happened to the 1M resistor from q1 collector to q2 base?
other than that it looks good to me
Title: Re: My Random Number Generator Layout
Post by: smnm on June 29, 2007, 09:15:18 AM
the designer is Doug Deeper /mid-fi electronics
Title: Re: My Random Number Generator Layout
Post by: mattpocket on July 04, 2007, 12:30:51 PM
Cheers. I have been away, so I will add that stuff in asap.

Thanks guys!
Title: Re: My Random Number Generator Layout
Post by: dr.benway on August 25, 2007, 06:20:13 AM
First off, sorry to bother Matt Pocket and Ambulance Voice with the same message as a personal mail but I just finally noticed the reply button that allows posting.

So, regarding Matt's layout, two questions :

Does the missing 1M resistor go directly from the collector of Q1 to the base of Q2 ?
Can I pop it in on the back of the board or with a jumper ? I've already populated and soldered and it's a tight and messy fit.

Thanks for your help
Title: Re: My Random Number Generator Layout
Post by: ambulancevoice on August 25, 2007, 07:58:53 AM
yep, it does
Title: Re: My Random Number Generator Layout
Post by: dr.benway on August 27, 2007, 04:59:38 PM
ok thanks.
finally got it working using your layout to perfboard matt, thanks ! 
took me some time, but I think that's mainly because I'm an electronics illiterate :
I got thrown off by the trace from R5 to C4, thinking it was connected to the base of Q3 (If only I'd looked at the schematic sooner!), as well as the hole next to R8.



Title: Re: My Random Number Generator Layout
Post by: Asarge519 on September 17, 2013, 08:39:32 AM
Hey everyone, I'm new to the site. I know this is an old thread but I was wondering what would have to be changed in order to run this off a 9v power supply? Just the plug instead of a battery and a cap across that or more? thanks
Title: Re: My Random Number Generator Layout
Post by: anchovie on September 18, 2013, 05:07:55 AM
No harm in putting a 100uF filter cap between 9V and ground, just in case your PSU doesn't already have filtering. If you want polarity protection, put a diode in series like this:

PSU positive ----------|>|----------- Effect 9V
                                           |
                                           |+
                                          == 100uF
                                           |
                                           |
PSU negative ------------------------ Effect ground
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