Cooking transistors: any recommendations?

But ITT Cannon, who I believe invented the D-subminature connector family, says that the second letter indicates the shell size.

For standard-density connectors, an "A" shell holds 15 pins, "B" holds

25, "C" has 37, and "D" has 50. "E" (apparently an afterthought) has 9 pins.

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Low level, low noise, high gain less than 50 mA collector current): NPN 2N5089

PNP 2N5087

General purpose, less than 300mA collector current: NPN 2N4401

PNP 2N4403

You will never run out of things you can build with these 4.

Among the ZTX000 series are some pretty good workhorses suitable for around 1 to 2 amps and up to over 100v - but they aren't the rock-bottom cheapest.

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~ Adrian Tuddenham ~
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I like BCX70/71. Betas are huge.

And 2N7002 whan a fet is appropriate, which is most of the time.

John

With "cooking" as an adjective rather than a verb! I'm just looking for recommendations as to a general purpose 'cooking' transistor that's a sufficiently good compromise to be able to reasonably handle both switching and linear amplification with low-ish noise. The kind of discrete device you can buy dirt cheap by the bucket-load. Power handling and transition frequency not critical; just a bonus. Anyone got any favourites they'd care to name?

p.

--

"What is now proved was once only imagin\'d" - William Blake

I've had a couple of bottles of TO-92 case transistors for 20 years now; I'm slowly working through them. They're from a big box of stuff donated by Tektronix to the Portland State IEEE student chapter. We just loaded up a pound (or maybe 5) of stuff per box and sold them for a couple of bucks per box.

They're all house-marked, but whenever I need a jellybean small signal transistor I just shake one out and use it. Hasn't gone wrong yet.

--

Tim Wescott
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Well I don't care! I personally like them smoked over an open fire...

Tim

-- Deep Fryer: a very philosophical monk. Website:

That's the term we tend to use, instead of cooking.

--
 Thanks,
    - Win

Maybe back East you do. Out West we call them gumdrops.

John

"Paul Burridge" wrote in message news: snipped-for-privacy@4ax.com...

2N2369 for NPN 2N5771 for PNP

Tam

Aren't 2n2369s gold doped? (It has been a long time since I played with those.) IF they are gold doped, they might not be optimal for small signal applications (they might be a little more noisy.) Perhaps it was the 2n706 that were gold doped? I seem to remember that the 2n706 tended to be noisy as HF/VHF oscillators. AFAIR, the gold doping helped to mitigate some of the storage effects of saturation.

2n2369s are moderately fast (given transistors of that era), and I seem to remember that the batch that I had many years ago had the cool negative resistance effect (leave base open, relaxation oscillator with neg resistance between collector/emitter. I seem to remember that it required 20-30V of bias. The transistor would no longer work very well as a regular transistor after abusing it as a negative resistance oscillator, but YMMV.) These memories come from the 1970-1975 timeframe, so might be a little distorted.

Nowadays, for non-switching applications, perhaps an MPSH10 might be a slightly better choice for the NPN.

John

"Cooking" should be anything you can get cheap or surplus: Personally I have scored, free, or almost for free, large qtys of:

ZTX xxx (Several p/ns)

2N2369A 2N3055 both metal and plastic and several others whose specs are almost irrelevant, I just got hundreds for free.

They all work fine,

Barry Lennox

I thought out west was "plain vanilla".

--
Mark

Is a "cooking" transistor a transistor that you cook with? ;-)

But speaking of grab-bags, I once had a job as a Radio Shack floordroid. I saw them make up a grab-bag once, and it was composed of trash from behind the counter (like, returns, or stuff that they didn't buy but nobody had got around to re-shelving) and, yes, literally, stuff we found on the floor.

Cheers! Rich