This circuit was found in American documentation from the 1960s. The operational amplifier is from that time, but the configuration applies to modern equivalents.
One 40108 Schmitt inverter or one 4093 gate can be used as a half monostable to be triggered by...
This circuit is from an Electronics Now from August 1995. The triac is according to the load that...
This Siliconix circuit was found in a 1980s documentation. The coil consists of 18 turns of 22...