The circuit shown in the figure was found in a 1974 publication. The field effect transistor may be the MPF102 or BF245 and theunijunction 2N2646. The SCR is a GE version of the well-known TIC106. The relay coil must be in accordance with the voltage used in the power supply.
10 Minute Timer (CB1501E )
- Written by: Newton C. Braga