07-11-2012, 07:11 PM
Many moons ago I had, at work, a Tektronix Hall probe. Splendid bit of kit, but a fearsome price.
2 Series Volvos used a complex Read Relay which was fed with the currents from the lamps on each side in antiphase. If the lamps were on they cancelled out, but if one failed the relay operated. Of course, if both similar bulbs on each side failed it didn't work. As Mark say, the currents were a lot bigger than you'll have.
Alan
2 Series Volvos used a complex Read Relay which was fed with the currents from the lamps on each side in antiphase. If the lamps were on they cancelled out, but if one failed the relay operated. Of course, if both similar bulbs on each side failed it didn't work. As Mark say, the currents were a lot bigger than you'll have.
Alan
