The figure shows how to couple two TTL circuits using an optical coupler to obtain isolation. The circuit is shown in the August 1992 issue of Radio Electronics magazine.
This high-gain digital amplifier uses general-purpose transistors. The supply voltage is logic...
Simple timers can be designed using inverters or any other gate that can be connected as inverter. Figure...
We found this circuit in the National Semiconductor Audio Handbook of 1977. The circuit produces...