This circuit is from 1980s documentation. The maximum operating frequency is 3.5 MHz. The current of the LED can be from 0 to 100 mA. The integrated circuits used are from that time.
This circuit should be placed between the signal source and the input of a recorder or amplifier....
The input frequency of a signal applied to this circuit will be divided by one to 9999 in this...
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...