Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The circuit requires a symmetrical power supply.
This encoded lock circuit with alarm for use in homes was found in a publication from the 90s. The...
The circuit shown was found in the 1994 National Semiconductor Linear Applications Handbook. The...
This circuit is from a 1979 documentation. The FET can be the BF245 or MPF102 and the bipolar...