Thread: MC1350 IC's
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Old February 4th 07, 03:02 AM posted to rec.radio.amateur.homebrew
[email protected] LenAnderson@ieee.org is offline
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Default MC1350 IC's

On Feb 2, 4:40�pm, ken scharf wrote:
wrote:
On Jan 31, 7:26?pm, wrote:
On Jan 31, 4:06 pm, wrote:


I have a bunch (50?) of MC1350's
I think they are 45 MHZ TV IF Amps.
anybody need some?
I'm interested in a half-dozen or so. Please forward details to
.


Thanks,


* *MC1350s are still being produced (!) and can be bought
* *from Jameco...www.jameco.com...$1.95each, $1.85
* *quantities of 10. *Jameco's catalog 271 has them as
* *"audio amplifiers" * :-)


* *Those are the plastic-packaged offspring of the original
* *Motorola MC1590, intended for any sort of RF amplifier-
* *with-DC-gain-control from low AF on up to 70, 80 MHz.
* *Differential input, differential output, gain control to
* *beyond 50 db, very good constant input impedance on
* *each input side. *Open-collector on output so there is
* *good flexibility in its load configuration. *Turns out they
* *also make good limiters.


*


There was also the MC1351 which was a 'hotter'chip with more gain


...and the MC1349. But, Lansdale bought the rights and
production "rubyliths" to the 1350 and either ON Semi
or Freescale (the splits of old Motorola Semi) indicate
they are still production items.

The 1590-1350 and variants are output-open-collector,
therefore their individual stage gain is a function of the
load impedance. You can get an easy, stable, wide-
band gain of 30 db plus, all the way out to 60 MHz.
Input impedance is a constant 5 K in parallel with 5
pFd each input, easy to deal with since it isn't that
sensitive to output loads.