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The Zoom H1n makes lovely clear recordings of the ETI Vocoder which I'm re-building. In this video, some power supply issues are resolved.
Any questions about JLCPCB or ordering, pls email support @jlcpcb.com
The Zoom H1n makes lovely clear recordings of the ETI Vocoder which I'm re-building. In this video, some power supply issues are resolved.
Mr Blue Sky!
use some clamp on chokes on your power …. put them on one by one till the power noise is gone
I think I still have my vocoder board that I used 40 years ago … must try to find it and take a picture of that.
Hi Julian, I have one of your PWM5 charge controllers and am wondering if I can perform a definitive test to determine whether it is working correctly. The LED is flashing merrily away but it would do this if just connected to a battery. In my installation on a boat the batteries are also charged by the engine alternator. Look forward to your reply. Regards Mike
EXTERMINATE!!!
I could ignore the HF noise from the PSU but even before you played with the vocoder your voice became very nasal 🙂
See I would never have the patience to build something like this, probably why I brought a VC340, it's nice because the original it cloned (the Roland VP330) was used on countless records where a vocoder was needed (as it was simple to get a great vocoder sound) so it sounds as you would expect.
Amazingly it's sound generation is all analogue (no DSP/software emulation) and is the first string machine to come with a factory MIDI interface.
Some people say cloning is easy but it ain't always easy, esp. if the original uses un-obtainium components.
In some cases, though, to solve the problem of long discontinued chips Behringer has a fabless chip company, Coolaudio, that can have old chips remanufactured where necessary (i.e. it cannot be properly emulated with multiple components) which it also sells to other companies, to that end one of Behringer's rivals, Roland, uses Coolaudio BBD's in it's waza craft chorus pedal! (DC-2W?)
Great stuff Julian. Just need to modulate it with a keyboard and sing us some Christmas songs in a few weeks. Good job we have JLCPCB, the original perf board modules would have sent you insane to get to this point! 🥴
Keep a careful eye on ground loops.
RIP Headphone Users
To solve the power issues, if this is intended to run from a single 12V nominal supply (e.g, lead acid battery system), you could do with two suitably rated DC-DC converters that have isolated / floating outputs. Then you can use them to make a +12V, 0V/GND, -12V supply system. But make sure that the DC-DC converters operate outside the audio spectrum and have excellent output filtering. Of course, you can add further filtering if you wish.
If it is intended to be powered by the mains, then use two suitably rated SMPSUs that have isolated / floating outputs. Then you can use them to make a +12V, 0V/GND, -12V supply system. Again make sure that the they operate outside the audio spectrum etc…