The 2N2646 UJTs came today. Could not resist to try some things,
A 30 second LED flasher
+9V ------------------------------------ | | | | | --- [ ] [ ] \ / -> green LED | 50k | 2k2 --- | to | | | 100k |--------- | e |--- b2 |-------\| 2N2646 | |--- b1 === | --- [ ] 10 | 470u | /// ///
What's the efficiency of that? I'd guess it's in the 0.01% ballpark.
PUTs, the synthetic version of the UJT, were interesting parts.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com
Were? They're as cheap as any other four layer device today.
No SMTs and no product development, but there's still fractional millions in stock / being made.
PUTs have lower "leakage" than UJTs (which don't so much "leak" as be a resistor in the off state) so the efficiency will be higher, too.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com
Doesn't help if you can't get it:
Oh well, probably only China buys 'em anyway for legacy products, and they're quite happy with THT.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Digikey hardly stocks anything any more.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com
Apparently, some of it is off spec, too. Dave's EEVblog slams Digikey for selling off-spec .1% tolerance resistors:
nb
-- vi --the heart of evil!
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.