This circuit for the 60 kHz range was found in 73 magazine and published in 1995. The circuit uses a ferrite rod. Note the direction of the coil windings.
The configuration of this function generator is not unusual. Only the adopted symbology is...
This filter operates in the “opposite” way to the previous one (CIR8814), cutting all signals...
The same basic audio oscillator as the CIR15855E can be modulated automatically by a relaxation...