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.
Antenova Grandis antennas can be purchased from Mouser Electronics for frequencies from 868 MHz to...
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...
The configuration shown in the figure allows you to implement an debounced switch with CMOS or TTL...