[sdiy] Pulser & Ring Mod PCBs from by Music Easel adaptations available; New Year's Eve Special

[Dave Leith]

Thanks for the reply Aaron

I've studied the schematic and it "seems" that this odd behavior is
normal but I'm not totally sure. And if it is correct of course I'm
curious why....

Here's a bit from an older question of mine

Not sure if this is normal but it seems to be created by the capacitor (910pf to
ground) that is in the reset circuit and stretches the length of the
reset pulse. The cap is on the front panel. If the cap is removed one
gets a perfect downward ramp at all frequencies. The reset circuit is
connected between pulser pls in <3> and pulser pls out <2>


On Sun, Jan 16, 2011 at 10:29 AM,  <lanterma at ece.gatech.edu> wrote:
> On Jan 16, 2011, at 12:53 PM, Dave Leith wrote:
>
>> I have a question about the pulser board. Does the cv output
>> (downwards ramp) maintain a sawtooth ramp (1) shape at the faster
>> speeds or does the top flatten out (2).
>>
>> 1, Normal cv (subaudio rate)
>> .           .            .            .
>>   .        .   .        .    .       .   .
>>      .     .      .     .       .    .      .
>>         .  .         .  .          . .         .
>>            .            .            .            .
>>
>>
>> 2. does one get higher speeds like this?
>> ....        ....         ....         ....
>>   .        .   .        .    .       .   .
>>      .     .      .     .       .    .      .
>>         .  .         .  .          . .         .
>>            .            .            .            .
>
> Hi! Interesting question... I've built a couple of the pulsers, but I never looked at the waveform of the pulser on the scope. I listened to it on the speaker, and used it to drive various CV inputs of oscillators and filters and what not to make whoop-whoop sounds. I was frankly so thrilled that it was working I didn't dig in much more.
>
> If I had a working scope I'd check it out and let you know, but right now (a) I broke the ground pin on my scope probe, and (b) my scope is kind of freaking out and claims a 120 volt 60 Hz sinusoid is superimposed over anything I'm trying to measure. Fortunately this signal that looks mysteriously like mains current isn't actually showing up on the scope proble - but it does appear my scope is kind of buggered. :(
>
> - Aaron
>
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