This TTL circuit was found in a 1978 technical documentation. The power must be supplied with 5 V. It converts ASCII characters to hexadecimal.
This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974....
We found this circuit in a technical documentation on thyristors from the 70s. The circuit is set...
August 2017 - Microchip's new ATtiny1617 8-bit AVR microcontrollers running at 20 MHz and 16 kB...