Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational can be a modern equivalent.
This low-frequency circuit for alternating signals is from an early American 1980s documentation. The...
This 2003 circuit does not transport any passengers, it only synthesizes a sound almost identical to...
This treble and bass control drains some milliamperes from a 12 V supply and can be used with any...