22 Dec
2002
22 Dec
'02
6:13 p.m.
Tony Duell wrote:
Yup. Right input, auxiliary channel. Totally stuffed.
Another trick that I've used is to use 2764s (easy
to find). You can
fit them into the 24 pin socket, and just about all the pins match
up. Solder wires (or some other kludge) to connect pin 2 (A12), 1
(Vpp), 28 (Vcc), 27 (PGM/), 36 (Not used, but now in pin 24 of the
socket, so that it's +5V) together after programming the 4K image
into the upper half of the chip.
I take it you mean pin *26*, not 36... Looks like
I might be able to do
that. If I can get hold of some 2764s. Unfortunately nearly all the
programmable memory devices in my junk^H^H^H^H quality used parts box are
27128s, 27256s or Intel/Catalyst 28F010s. Oh, and I've got a few 27512s if
they're any good...
I would have to hunt for them, but I might have a
couple of new
Hitachi 462532s in the OTP (plastic) package.
[snip]
I have no idea if they're good, and I don't
think I can easily program
them (that was to be another project if I had to re-burn the firmware
for the meter), but if I can find them, are they any use to you?
If you can find
them, they'll be very useful as they're (supposedly) pin
compatible with the TMS2532.
And just
when I thought this year couldn't get any worse, my
Sansui 210 tuner-amp decided to blow its right aux channel this
morning. Although this
Do you mean it's just one input that's failed?
It's the output stages
that normally give trouble. You do, of course, have a ready-made reference circuit
to compare
against
-- namely the left hand channel :-)
Good point.
Later.
--
Phil.
philpem(a)dsl.pipex.com
http://www.philpem.dsl.pipex.com/