Trouble shooting the Simple Keyer kit 9/6/2007 Chuck Olson Soldering problems are often the cause of kits that don't work correctly. Sometimes the solder joints are cold and don't conduct well enough, sometimes there are shorts between adjacent pads. I did a little measuring with my ohm meter and volt meter on the prototype Simple Keyer kit. This data may help locate the problem. First, the voltages present on the two ICs, input voltage to the keyer is 8.76 volts. The inputs and output are open. 4013 pin voltage 1 0 2 8.76 3 8.76 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 8.76 13 0 14 8.76 4001 pin voltage 1 0 2 8.74 3 0 4 0 5 8.74 6 0 7 0 8 0 9 3.5 (varies with pot position) 10 0 11 8.76 12 0 13 0 14 8.76 Next, I removed the power and the ICs and did resistance measurements, connecting the negative lead to ground and measuring the resistance of each pin of the two IC sockets. open means that the resistance is very high. > 1 meg means that the resistance is not quite as high as open (I did the resistance checks on a VOM, my DVM isn't working correctly on resistance). 4013 pin resistance 1 > 1 meg 2 open 3 open 4 0 5 open 6 0 7 0 8 0 9 open 10 0 11 > 1 meg 12 open 13 > 1 meg 14 open 4001 pin resistance 1 > 1 meg 2 open 3 open 4 open 5 open 6 > 1 meg 7 0 8 open 9 open 10 open 11 open 12 0 13 open 14 open