Equipment Hints and Modifications Page
Circuit to prevent SEND relay failure
Simple Circuit to prevent SEND relay failure -
example - in ICOM transceivers like IC-756 series of radios.
Note: The TIP31 (NPN BVceo = 40V) is a substitute
for the 2SD1406. The TIP32 (PNP, BVceo = -40V) is
a substitute for the 2SB834. The TIP31 and TIP32 are
available at Digikey, eBay and most electronics parts houses.