As I always seem to do, I make odd suggestions not quite exactly what is being asked, and in this case probably overkill, and maybe over power budget: A raspberry pi has analog audio input and output. You may need to pad headphone down to line level for the input. Output is headphone level. After that it's all software. If you want to dispense with the voice changing portion, one could always just use one of the text to speech libraries/applications. On the other hand, if you do want the voice changing, a quick google search for "raspberry pi voice changing" and similar yield various interesting projects which do this type of stuff. There are lots of filtration libraries. On Thu, Jun 14, 2018 at 2:07 PM, Neil wrote: > Anyone know of a good quality robot voice changer that will take a > headphone-level signal, and spit out either a headphone level signal or > an amplified signal? The ones I've found so far get poor reviews for > sound quality and I feel like the basic on-board amps are a significant > part of that, so unamplified is fine and I'll add a separate amp. This > will be used for a robot project, and the voice needs to sound like a > friendly robot that should appeal to kids. > > Though I would prefer a pre-built device (as I'm on a very tight > schedule), I'm tagging this as EE in case anyone has a good circuit or > kit) for this. > > Cheers, > -Neil. > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 forrestc@imach.com | http://www.packetflux.com --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .