R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
September 2017 - Arduino Lucky Shield shields containing a 5 V OMRON-g6RL relay, a Everylight...
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...