Stuck trying to connect 1.5v DC output from a digital timer to a piezo siren.

Discussion in 'The Projects Forum' started by Stuntmonkey, Nov 17, 2010.

  1. Stuntmonkey

    Thread Starter New Member

    Nov 17, 2010
    Hello. I am a small time tinkerer and I am stuck. I have a 1.5v dc digital timer and I want to replace the stock speaker with piezo siren that operates between 6-14v DC. Here is the link: Siren. From what I understand I will need a solid-state relay to connect the speaker output to the piezo siren and battery. I have searched 5 different stores and and searched the web, but I could not find a relay that would work at that low voltage. I hope that someone may know of a relay that would work, or know of a different way to do this project. I appreciate any help.
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
  3. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    The piezo siren (it is an electronic power oscillator) probably operates from smooth DC, not the modulated DC from the timer.
    For a collector current of 150mA to drive the siren, the transistor needs a base current of 15mA (not just 0.7mA) but the timer probably does not have an output current that high.