My TR7 manual shows U201 as a MC14028 IC, not a PROM and Digi-Key sells them
for 52 cents, am I missing something here.
Mike W6MXV
----- Original Message -----
From: "Jim Shorney" <[email protected]>
To: <[email protected]>
Sent: Monday, March 22, 2010 4:09 PM
Subject: Re: [Drakelist] R-7 Control Board Fix
Dave,
How about you submit this stuff to WB4HFN for articles on his web site?
Preserve it for posterity, as it were.
73
-Jim
On Mon, 22 Mar 2010 14:54:24 -0500, Dave Childs wrote:
I used a perf board & wire wrap termination but any wiring style should
work fine. Also, I used 1N5817G Schottky steering diodes to reduce
internal voltage losses although 1N914/1N4148 should work just as well. If
you want a copy of this circuit &/or the truth table let me know off list
via e-mail & I'll send it. [Also, if you want to use the Aux. Program
switch to select P/S voltages this switch has shorting/overlapping [make
before break] contacts so it must be replaced with a non-shorting type.]
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