This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz....
This interesting logic circuit was found in a manual of neon lamp applications. | Clique na imagem...
This is the traditional configuration of a window comparator using operational amplifiers such as the...