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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
yes, negative resistance is at the heart of the circuit. I first come across the same in 1968, in an article in a magazine called 'Wireless World'. As is stands it is useful as a rough sawtooth osc, and it only takes about 2 minutes to construct.
The base, although unused here, can be used as a sync input, if the oscillator is used as one of a group in a toy organ. Each base, if driven from a lower, modulating frequency, causes all oscillators to synchronize with the mod frequency, or so it was said at the time of publication.
The transistor should be a silicon planar type, as ony these types will work, I think.
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