Electronics > Projects, Designs, and Technical Stuff

Available Audio UJTs?

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phdinfunk:
Hi,

Years ago, I used 2N4853s for audio frequency UJT.  I got the basic design out of a book in the university library at the time.  It appears to be out of production by now.  Are there any similar good audio UJTs around?

I can build using other methods, but the oscillator with a UJT kind of sounded like a buzzsaw.  I'd like to play with that again.

--Winter

edavid:
There are not any left in production, at least outside of China.  They are also pretty expensive on eBay.

Has anyone tried these "BT33"s?

https://www.aliexpress.com/item/20pcs-lot-BT33F-BT33-semiconductor-triode-unijunction-transistor-double-base-diode-gold-seal-new-original/32813580282.html

T3sl4co1l:
You can make identical waveforms with PUTs, a comparator, 555 timer, etc.

Tim

chris_leyson:
Complimentary feedback pair is sometimes used, http://www.4qdtec.com/putpr.html

technix:
This will sound weird, but some MCU can even be cheaper or smaller than 555's like STC15W100 in SO-8... So code one up? With that 8051 chip you can let the timer to do the actual output, and after setting everything up just put the processor part into sleep.

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