A cool Website for Small Signal Transistor Addicts

Index_e is the English Page

Steve

On a sunny day (Tue, 25 Nov 2014 07:58:05 -0800 (PST)) it happened " snipped-for-privacy@Null.Com" wrote in :

Interesting, never knew CdS cells were sensitive to X-rays (amplifiers - xray detector).

Where are the "current source topologies I had not seen"? ...Jim Thompson

Found a number of them under "Power supply"... saw nothing new, but I've been doing current sinks/sources/mirrors for more than half a century ;-) ...Jim Thompson

I found a zener in a diode bridge, as gain control for a Wien bridge oscillator. That was a new "mixture" for me. (I've never done a "real" current mirror... only unmatched discrete transistors.)

George H.

That's a Pease trademark circuit from Philbrick in the 1960s.

Cheers

Phil Hobbs

Yeah sure. (I love B. Pease's Bounding and clamping techniques Article.. circa ~70's in EDN) I'd just never thought of it for use as a gain control element.

George H. (I haven't been doing serious electronics for as long as most here so...)

And lots of "USSR germanium" PNPs... entertaining, but mostly 30-40 year old app circuit stuff, drifts all over the place.

Just like you.

It is interesting. I thought that this was a very clever "crystal set" in the way it minimises crossover distortion:

John

On a sunny day (Sun, 30 Nov 2014 11:34:10 -0800 (PST)) it happened snipped-for-privacy@gmail.com wrote in :

Nice, I did publish an amplifier test with RF bias reducing distortion here some years back. For a moment I was thinking about the old 2 transistor 'reflex' receivers, where the same transistor[s] was[were] used both as RF and then as LF amplifier. An example here:

You could do that to that Russian circuit perhaps... Not to confuse 'reflex' with 'in phase RF feedback to increase selectivity'.