I'm wondering if I got moderator approval to be back on the list
On Wed, Aug 26, 2026, 1:22 PM Benjamin Lockhart <
benjaminlockhart99@xxxxxxxxx> wrote:
> I tried to send this before but it didn't get through.
>
> Hi Jeff,
> I'm building a fully analog synth designed from scratch to work as a DRSSTC
> interrupter.
>
> It will have 4 voices of polyphony that can be split between 2 coils if
> desired, each voice consists of 2 voltage controlled oscillators which can
> phase against each other if desired (helps the bass notes sound fuller) or
> hard synced together for a different cool sound.
>
> I'm using a MIDI to CV converter module for eurorack modular synths (the
> Majella MCVC) to take the MIDI input and get 4 voices of CV and gate
> information.
>
> There will be 2 ADSR (attack, decay, sustain, release) envelope generators
> triggered by the gate signal when a key is pressed (and there is some
> latching logic so that the decay phase can work even after the key is
> released if desired) One envelope will control the on-time (pulse width) of
> the DRSSTC output, and the other one can be assigned to more complex
> modulation things.
> I want to try modulating the frequency of the oscillators with noise to
> maybe make percussive sounds as well.
>
> There is an output stage that takes the signals from all eight oscillators
> and combines them, sets the output pulse width, and applies a duty cycle
> limiter set to around 10% to make sure the coil never overheats no matter
> what notes are played. It will shorten the width of all output pulses if
> the total duty cycle exceeds the limit.
> It also has a control voltage input from the envelope generator for the
> pulse width, and a holdoff timer to make sure no pulses can be sent out too
> close together. This can result in hard switching of the bridge when the
> primary is still ringing down from the last pulse and the interrupter turns
> on again because most DRSSTC drivers don't synchronize the interrupter
> RISING edge to the feedback signal, only the FALLING edge, so the bridge
> can be enabled at any point in the RF cycle, not just the zero crossings.
>
> It is effectively a paraphonic synth because you cannot control the volume
> of different notes played at the same time independently, all notes at one
> time have the same pulse width.
>
> There will also be a low frequency oscillator for vibrato and probably more
> modulation options.
> There are no microcontrollers or code other than the MIDI converter module,
> it's all analog hardware.
> It's not even half done yet but I plan on sharing videos and schematics
> once it is.
>
> Benjamin
>
> On Wed, Aug 26, 2026 at 11:50 AM daniel_kline7657--- via Tesla <
> tcml@xxxxxxxxxxxxxxx> wrote:
>
> > I have that same issue.Dan K.
> > On Saturday, August 22, 2026 at 03:17:44 PM MDT, Daniel Hess <
> > 1ssehd@xxxxxxxxx> wrote:
> >
> > Hi David.
> >
> > FWIW, I'm seeing them. For some reason, some, but not all TCML email,
> > goes into my spam folder?
> >
> > Daniel Hess
> >
> > On 8/22/2026 9:16 AM, David Thomson wrote:
> > > If my posts are reaching the list, I don't see them. This leads me to
> > think
> > > my posts are being filtered.
> > >
> > > David Thomson
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