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.
This beat frequency oscillator was found in a 1980s documentation. The original FET has a grounded...
This biestable can use a common comparator like the LM339 and the power depends on the load, which...
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...