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Recent content by JFL110

  1. J

    Relay voltage spikes

    Hi yes it was a 240V mains AC to 12V DC transformer powering a group of solenoids with a DC relay coil operated by a 5V micro controller circuit, the problem wasn't with the relays it was with the solenoid valves generating voltage spikes but fixing zener diodes directly across the solenoids and...
  2. J

    Relay voltage spikes

    Hi thanks for the help I've found that a capacitor across the transformer and a diode across the solenoid has solved the problem cheers
  3. J

    Relay voltage spikes

    ok thanks how would i calculated what capacitance to use?
  4. J

    Relay voltage spikes

    Hi I'm using some 12V relays to control some solenoid valves which are fed by a 240V to 12V mains transformer, the problem is that when the relays are engaged or disengaged it causes a voltage spike which can be heard through speakers attached to the same mains socket and is actually causing my...
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