If you are looking for shorts, then try and find a "Cheap Squeak" This device generates a tone that changes in pitch the closer to the two probes are together. So, let's say you have a node shorted to ground on a data line that has a dozen gates connected to it. Put one probe of the CS to ground and the other to the beginning of the data line. You shall hear a high pitched squeal, now move the probe down the line and the pitch will climb the closer to common/ground you get and then the pitch will start to drop as you pass the gate that is shorted. Back and forth a couple of times and you can find a short in a couple of minutes. This also works for traces that are shorted together or to Vcc....

I don't have any spares.

They are cool. Part of my favourite tools along with my logic comparator, scope, Heathkit Logic Probe (the best in my opinion! and I have HP, and other logic probes in my shop), and a logic state indicator (for slow logic like switch gates etc, it's a clone of the HP Logic Clip but does analog as well as digital devices) I can't recall the manufacturer but I picked my second CS on eBay as part of a Logic Test Set.

There is a HP current tracer on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1716244745

John :-#)#

At 04:23 PM 24/03/2002 -0500, Kev wrote:

I've heard about the HP547 are there any others?

Any better/worse than the HP547 for arcade board repairs?

Anyone have any to sell?

Thanks,
Kev
mowerman@erols.com