We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...
This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The...