This is the receiver for the previous transmitter. The signal consists of digital pulses with a compatible TTL or CMOS output. The integrated circuit is a 4093 and a photodiode of any type.
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
We found this circuit in a 2004 documentation. The trimmer is common for 30 pF or 40 pF and the...
This circuit activates a relay when the sensor receives light indicating dawn. A relay with a 4k7...