This is a continuation of a Facebook group post you can find here:
I’m working on a skiff-friendly 8hp version of the Cadet IV (ramps) module for myself, but as it seems like more people are interested in it, I’ll likely make it available for the community in one way or another – either a hybrid DIY thru-hole/SMT PCB/Panel set, or potentially a complete plug and play module. I’ve already planned and designed most of it, and it still is chiefly just a project for myself, so there’s not a ton of wiggle room that I’m willing to negotiate about, but I’m not so closed-minded that I won’t listen to ideas or requests.
As it is now, it’s an 8hp module with all the outputs of a Cadet IV and additional H & V triangle outputs hardwired through Cadet X (multipliers) in 4Q mode to provide adjustable fixed-frequency sines-(ish). The C-IV trimmers have been changed to 500k and moved to the front panel for convenient and wide-range control of the amplitude. The front panel has bias and attenuversion controls for the multipliers, which will be center-detent if I can get them dialed in the way I want. I’m gonna try to cram in CV inputs for the multipliers as well, but I’m not sure they’ll fit. If it comes down to available real-estate, I might sacrifice the sawtooth outputs for multiplier CV ins.
The things I’m not going to alter are:
- The front-panel as it’s described above
Two things I’m still considering:
- How the module will receive sync
I prefer the “@pbalj method” of H & V distribution, (through the power header) and I’ve modded a few of my modules to receive sync through it. Left to my own devices, this is probably how I’d do it this time as well. I think the circuit would need to be altered, because the CIV design doesn’t seem to get triggered by the 1v pulses supplied by C1, and it appears to be designed around receiving 5vTTL from the 14 pin sync header. I personally dislike the 14-pin header, and it seems to be getting phased out (although I could be mistaken?). The other option would be a posterior RCA jack which would require more parts, more cost, more complication, and would also not be useful for me… I guess I’m asking if you can live with receiving H & V pulses via the power connector. It makes perfect sense to me, but people seemed confused by the Castle VCO.
- Component footprint
I prefer SOIC chips to pdip, but I also like using through-hole passives. If this is going to be a DIY thing, are people terrified of SOIC? Personally, I find it easier, quicker, and it saves a massive amount of space. I still like through-hole passives though – just my preference FWIW.