Conventional automobile speed-warning devices require the addition of a multipole electromagnetic transducer in the transmission or the speedometer cable as a source for the speed signal. Here is a circuit that uses as the enginespeed signal the existing voltage pulses available at the primary of the spark coil. A switch in the transmission that is closed only in high gear is also needed.
Circuit warns automobile driver when he exceeds preset speed
Schaltung warnt Autofahrer beim Ueberschreiten vorgegebener Geschwindigkeit
Electronic Design ; 22 , 26 ; 106
1974
1 Seite, 1 Bild
Article (Journal)
English