[IMSAI Guy] grabbed an obsolete XOR gate and tried a classic circuit to turn it into a frequency doubler. Of course, being an old part, it won’t work at very high frequencies, but the circuit is ...

Figure 1: This circuit doubles the input frequency. The reference frequency in this circuit drives the input of an exclusive-OR gate (XOR gate U2) as well as the input to a delay circuit. Consisting ...

Perhaps you would like to ponder this circuit But we digress… As I mentioned at the beginning of this article, we are not allowed to use XOR gates as part of our solution. When I let folks know this, ...