Daniel,
The TI chip was test of a video amplifier.? It was not a drop in replacement.
The point, I think, is that we have to find someone who has experimented
with them to point out pros and cons.? And that was some time ago and
better chips should be available and maybe cheaper.
I'm a fan of a transistor, jfet or darlington pair replacement, if possible.
The RF range is well within the transistor limits.? It's just a matter
of finding the necessary gain in the circuit.
I was going to use the same RF PA transistor that Diz, W8DIZ <sk>, used in
the 1W and 5W series.? I have some in stock to play with when I get to
the build.? The PCB has the layout already in place.
I also spent $11.99 USD on Eliexpress to get a container of 840 transistors
from audio to RF frequencies to run tests on.? Film at 11.
Remember Spock from Star Trek?? You remember his famous hand signal?
It meant "Don't mess with super glue.".
chuck
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On 3/16/25 19:34, Daniel KK4MRN via groups.io wrote:
Chuck,
About the headers - yeah, I like the idea of using an IC socket and headers than doing dead bug style.? Good idea here.
And I want to build a SST-20.? Is the Video Op Amp TI TL592P a drop-in replacement?? or is there some re-design changes that need to be made like you suggested in your earlier Manhattan message?
As for the superglue, I think that is why I did better at the beginning with my first project with Manhattan Construction - a G3UUR crystal tester - because I used Gorilla glue but later switched to some off brand of superglue for other projects which was runny and took longer to dry.? That cheap stuff is where I had to learn how to use oil - well, I swiped some of my wife's olive oil - and put it on my fingers and desk - and let sit there... and working my fingers...? it does not work in a hurry... but it eventually works... and you have to keep moving it around... it works slowly.
73 Daniel KK4MRN
