This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent of BC548. Observe the relatively high supply voltage.
This circuit is from a Ferranti publication of 1968. The circuit generates a signal according to the...
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
This circuit is from a Hands-On Electronics from the 90s. The integrated amplifiers used are well...