This circuit is from an old Mullard (Philips) manual with applications using the 555. Choosing appropriately the resistors and the timing capacitors, the ranges obtained can exceed days.
This ultra-low power circuit uses a diac to flash an LED when connected to the power grid. The...
We found this small FM transmitter in a 1980 publication. What sets it apart from traditional...
This linear modulator was found in old documentation. The integrated circuit used is uncommon...