IIRC you can "make" a UJT using a PNP & a NPN bipolar transistor in the appropriate configuration. It's not quite as "good" but does work. Not sure about the PUT however. RP On 31 August 2016 at 06:50, graham foulkes wrote: > Hi > A UJT, can definitely be emulated by a SCR, or better still an SCS. The > unique characteristics of the UJT can be found in the very useful, ancie= nt > (like me), GE transistor manual. Unlike the aforementioned 10F's and cort= ex > offerings, UJTs only need a minimum of 3 resistors and one capacitor plus= a > smidgen of math to calculate the pulse rate, work with a wide range of > supply voltage and..... can deliver a heck of a sight more current in th= at > tiny little spike, perfect for triggering circuits, ramp generators, clam= ps > etc....... > Pics are great, used them from the early nineties, but properly > chosen, versatile analog components still can outperform the digital > implementation of a wide range of functions. Analog world remember, until > you get down to quantum levels. > > On Aug 30, 2016 10:01 AM, wrote: > >> >> A UJT is sort of like an SCR. It is a sort of triggered diode. >> This isn't exactly correct, but in general, it will give an idea of >> it's purpose. >> >> Regards, >> >> Jim >> >> > -------- Original Message -------- >> > Subject: Re: [EE] UJT >> > From: William Bross >> > Date: Tue, August 30, 2016 8:41 am >> > To: "Microcontroller discussion list - Public." >> > >> > >> > Dave, >> > >> > Slim pickn's is right, and fairly on the pricey side too. >> > >> > >> > >> > >> > >> > I've only used UJTs and PUTs for timers and oscillators that gave that >> > sharp little glitchy type output. So.....maybe a 10F? Would definitel= y >> > be cheaper nowadays. >> > >> > Bill >> > >> > >> > On 8/30/2016 9:05 AM, Dave Lagzdin wrote: >> > > One still sees schematics posted with UJTs as solutions to things. >> > > I'm curious if anyone has done something with one in recent history = and >> > > where would you procure such mythical devices? >> > > >> > > Pickn's seem slim at Digikey and Mouser... >> > > >> > > D >> > >> > -- >> > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> > View/change your membership options at >> > http://mailman.mit.edu/mailman/listinfo/piclist >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > 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 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .