[sdiy] problems going from breadbaord to pcb/solder

[cheater cheater]

Schematic please?

Try making your own pcb and see if you have the same problems?

D.

On Sat, Aug 15, 2009 at 11:35 PM, Dan Snazelle<subjectivity at hotmail.com> wrote:
>
> a friend of mine has been working on a vclfo partially based on
> the ray wilson VCLFO.
>
> it uses a triangle core with a lm13700, an integrator, and a tl072 comprator
>
> it worked without ANY problem on the breadboard
>
> however, when he soldered it up on perfboard the following problems arose:
>
> 1. the symetry is off. mainly as the oscillator gets slower and slower, the symmetry falls out of line. it is fine at higher speeds
>
> 2. at lower speeds, the oscillation dies. (at speeds which work on the breadboard)
>
>
> I told him to try changing the hysteresis resistor value and cap on the comparator and this DID help somewhat (it kept the osc from dying)
>
> however, things are still not quite right.
>
> IS THIS due to the difference between the capacitance on a breadboard and the capacictance on a soldered board?
>
> or could it be something else?
>
> anyone have any ideas on how to save this?
>
> i am very interested in the results as I will soon be moving some of my projects from breadboard
> to finished pcbs
>
>
> thanks so much
>
>
>
> --------------------------------------------
> check out various dan music at:
>
>  http://www.myspace.com/lossnyc
>
> (updated monthly)
>
> http://www.soundclick.com/lossnyc.htm
>
>
>
> http://www.indie911.com/dan-snazelle
>
> (or for techno) http://www.myspace.com/snazelle
>
> ALSO check out Dan synth/Fx projects:
>
> AUDIO ARK:
>
> www.youtube.com/watch?v=TJRpvaOcUic
>
> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
>
> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
>
> and soundtrack/design work:
>
> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by catherine chalmers
>
> http://www.catherinechalmers.com/videos.cfm
>
>
>
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