1/2/2010 - Counter Preamp II kit has sold out
The Counter Preamp II kit provides a high impedance input
amplifier for your frequency counter.
small (.7 x 1 inch) size
MPF102 JFET input, two PN2222 NPN buffer design
runs from 7 to 14 Volt supply
logic level (0 to 5 volt) output
For more information on the kit please
download (Right click/save target as) the Counter Preamp II kit
schematic diagram and
all in Adobe Acrobat (.pdf) format.
For any questions, please send an email to me, Chuck Olson, WB9KZY at:
with your question or the items you want and we'll email you a Paypal invoice.