[sdiy] My first schematic, me too

[harry bissell]

Hi Charles...

For the glide circuit, you can use a bigger cap.. or a larger pot of 
both. I've used up to 5 meg
pots with this.  If you go for a bigger cap, be careful to try and get a 
high-quality one like a film
cap (polypropylene or polycarbonate would be good, you will never find a 
polystyrene ~that~ big)

H^) harry

Charles Bisaillon wrote:
> As the team leader for our capstone project, my task was to build and design
> the VCO. My design is based on the ENS-76 VCO found in electronotes and
> other books with the expo converter using a CA3046. Anyways, I breadboarded
> the whole thing and adjusted the outputs to obtain 10 Vpp signals at the
> outputs, I had to make lots of small adjustments and I added the whole input
> section where a glide circuit can be seen based on a design by Harry
> Bissell.
>
> I am very content of the whole VCO circuit even though the design is very
> similar to the original, but this was my first time ever breadborading and
> drawing electronic circuits. I had to test the design in great depth because
> I used components I had in hand and then had to adjust everything to the
> desired specs.
>
> For the glide, I would prefer to have a 2Meg pot instead of 1Meg to get a
> longer glide time, I have to accept a fairly short max glide time as it is.
> I also put a 100k resistor to ground at the input to the glide circuit
> because it would not stay at zero volts when left unplugged, it would go to
> -3.5 V instead.
>
> Any critique is welcomed
>
> http://www.oveloe.com/490/vco_sch.jpg
>
> Charles
>
>
>  
>
> http://www.oveloe.com
> Voltage-Controlled Brain Waves
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