Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time, difficult to obtain today. The maximum frequency is 15 kHz.
Figure bellow shows how the flip-flops of a 4027 can be connected to perform a divide-by-5 counter [odd...
Maxim MAX20056B 6 Channel High Brightness LED Controller Maxim Integrated makes available through...
This circuit was originally suggested in a 1968 publication to generate a white mark (frame) on a...