Solar telephone (CB20504E)

This low-power intercom can be powered by solar cells. The circuit is two-way, with an integrated of the time. The circuit is from 1991.

Power Supply 0 to 5 V x 1 A (CB1185E)
This variable power supply uses common components and can supply a current up to 1 A. The...
Wien Bridge Oscillator MC1776 (CB4498E)
The integrated circuit used in this project is not common today, but it can be implemented with more...
1 kHz Multivibrator (CB486)
A square signal of about 1 kHz is produced by this astable multivibrator. Frequency is determined...