On Tue, 1 Feb 2005 21:28:25 -0500, "sean" wrote:

You know those chip clips that techs use on computer chips to test /
troubleshoot the chips?

Why not do the same thing to PLL's before actually wiring the final
connections when expanding channels?

It would work, use alligator clips or wire wrap the wires around the pins
that match the designated pins on the PLL chip and then use some switches to
test the switching of channels.

Try it out.

Better than wiring the whole thing up and making the wrong connection.


The problem with that approach is that some of the pins are hard wired
to ground or +5V and need to be "freed" or cut loose and the proper
pull-up resistor installed so that the pin can be switched. The
channel selector switch itself may "interfere" with your modification.
If, for example, the switch applies a hard +5V and you try to ground
it, you just shorted out the supply.

Depending on the make of radio, some of the pins may need to be cut
loose to fully change state. It's not as simple as just dropping a
chip clip on top of the PLL if you want full capability.

Dave
"Sandbagger"
http://home.ptd.net/~n3cvj