开云体育

Builders using Manhattan Construction (a.k.a Mad Hatters),

1.? I use 2.54mm male and female headers for several purposes. See ebay and sort by
price+shipping and search for the number you need.? 40pin single row is what I get and
cut to the number of pins needed.? Using a PCB flush cutter, sacrifice on hole on
the female strip by cutting dead center.? The male strip has notch between pins.
Image 2156.jpg shows using male headers for IC socket super glued to PCB.
Note, plastic melts when heated, especially the nylon strip holding the male pins.

2.? Image 3444.jpg shows header in center laying flat to plug in different band
toroid for a regen receiver.? Somewhere, outside the 4000+ images I current have
in one directory, is an image of the module in place.? This is a muppet board.

For those interested in doing the SST-40 or SST-20, see Dave, AA7EE, web page.
You can't do any better than that.? But it is a great build and a great project.
The problem is the LT1252 being obsolete and astronomical in price for the PTH
part.? I did an experiment with a TI TL592P, PTH part, 50MHz differential
video amplifier with adjustable gain some time ago.? 2659.jpg for the muppet
board.? Notes somewhere, but the part is $9 for 3 on ebay that I found.
I think that a search for video op amps will do the trick to replace the
part cheaply.

Some one sent me, I think off line, a schematic for an SST with the IC replaced.
I have had that schematic for a long time and built one.? 1540.jpg is start
and the rest is off on a DVD, if someone is interested.? I also did a muppet board,
the largest one I've ever done.

Point:? The ADC transceiver.? I'm thinking of using the 2.54mm headers
to build sections as modules and connect them neatly. Kindergarten
training of keeping things inside the lines behaviour.? This allows for
testing of modules as I build them and possible improvements with tests
and any updates you guys and girls find or develop.? I'll also build the
PCB version before letting the Gerbers loose.? atx-40m.jpg board.

I did buy two bottles of super glue at Home Depot.? One loctite and one gorilla.
The gorilla sets in 10 sec, the loctite a little longer.? There is a use for
both set times, I think.

FYI

chuck, aa7fo, the one who photographs work for no known reason, except to justify
having a digital camera

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