The two integrated circuits used in this configuration can still be found. The frequencies of the effects are determined by the capacitors, which may have their values changed.
The low-noise amplifier shown uses a rare Raytheon operational amplifier today. The circuit can be...
This configuration makes use of an LM3900 transconductance operational amplifier. The transistor can...
This key is turned off by a touch sensor. The time it remains active depends on capacitor Cx. The...