https://diode.zone/videos/watch/cb8cb046-67ef-461e-a6f5-6c537abf58bc After discovering a pack of 10 SMD buttons in my parts bin, I randomly got an idea to build a small analog synth on a perfboard. It's built around a two-2N2222 multivibrator with a capacitor string connected to one of the bases, which allows choosing a different capacitance and thus frequency by pressing one of the seven buttons. The resulting "scale" is pretty unusable for anything serious but does allow playing interesting tunes. A double 10k potentiometer can be used to vary the base bias resistance of the transistors, providing an extra, more precise way of changing the output frequency. Tue, 20 Oct 2026 14:41:10 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://diode.zone https://diode.zone/lazy-static/avatars/61b689b7-84d5-43c7-9fa8-e63a7fd1d952.png https://diode.zone/videos/watch/cb8cb046-67ef-461e-a6f5-6c537abf58bc All rights reserved, unless otherwise specified in the terms specified at https://diode.zone/about and potential licenses granted by each content's rightholder.