This circuit is from a Ferranti publication of 1968. The circuit generates a signal according to the crystal. The transistor may be a modern equivalent.
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...
This 9 + 9 V symmetrical power supply was obtained in a 1977 symmetric publication but can still be...
This simple circuit for switching RF signals was found in an RF Design from the 90s. The circuit...