Found in a 1970 EEE, this circuit can be applied to TTL ports. The supply is 5 V and the frequency, which depends on the crystal, can be between 1 and 3 MHz.
I found this circuit in an article in a 2003 publication. The circuit is an example of how to...
This 9 V amplifier has a gain of 20 and provides a power of a few hundred milliwatts. The circuit is...
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...