I thought UJT's were obsolete, but the data sheet is from May 2000!
I'll have to take another look at them.  The high current pulse output
could drive an IR LED pretty well.

Sherpa Doug

> -----Original Message-----
> From: Spehro Pefhany [mailto:speff@INTERLOG.COM]
> Sent: Thursday, July 12, 2001 9:44 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Programmable UJT transitor
>
>
> At 09:28 AM 7/12/01 -0400, you wrote:
> >how do these work and what are they?  I have 25 2N6027's which are
> programmable UJT's.
>
> They are a special type of low-power thyristor designed for timing
> circuits. I used
> to use tons of them ages ago in industrial timer module designs.
>
> http://www.onsemi.com/pub/Collateral/2N6027-D.PDF
>
> Have a gander at figure 3/8, that's how they are normally
> used. The pulse
> across
> the 20R resistor in fig 3 can be used to trigger an SCR or whatever.
>
> Best regards,
>
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