This circuit was found in an Electronics World of 1968. The transistor can be any general purpose and the double T must be set to R3 for the desired effect.
One 40108 Schmitt inverter or one 4093 gate can be used as a half monostable to be triggered by...
This power supply also has a fine adjustment feature. The transformer is 16 + 16 V with 3 A and...
This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated...