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 small FM transmitter for short distances has a stereo multiplexer and can be used over an...
This commercial circuit of 3 transistors was found in Japanese documentation from the 1960s. The...
We found this circuit on Motorola's 1993 Linear Interface ICs. Equivalent operational amplifiers can be...