This circuit was found in the July 1988 issue of Radio Electronics magazine. It makes use of an operational transconductance amplifier (OTA) still in use today.
The frequency of this circuit depends on the crystal. The transistor supports a modern equivalent. We...
This circuit is from 1992 documentation, but it can still be assembled today, as the components used are...
Found in an Analog Devices documentation from the 90s, this circuit uses operational amplifiers from the...