General > General Technical Chat
Car alarm siren issue
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Zero999:

--- Quote from: slybunda on February 10, 2024, 03:03:59 pm ---Toad alarms said they can sell me a replacement siren which is at a ripoff price. No warranty since alarm comes with 1 year warranty and iv had it for over 20 years.

--- End quote ---
What's so special about this siren? Have you looked into replacing it with a third party one? It's likely that's the most economical solution.
NiHaoMike:
I would fit a pair of SPDT relays to the existing car horns, wired so that by default, the horns operate as usual and activating the relay activates each horn individually. Then use a classic 2 transistor oscillator to alternately operate the relays when the alarm is sounding to give a high/low cycling rather than the usual car horn sound that often gets ignored.
mendip_discovery:

--- Quote from: Zero999 on February 10, 2024, 05:07:31 pm ---
--- Quote from: slybunda on February 10, 2024, 03:03:59 pm ---Toad alarms said they can sell me a replacement siren which is at a ripoff price. No warranty since alarm comes with 1 year warranty and iv had it for over 20 years.

--- End quote ---
What's so special about this siren? Have you looked into replacing it with a third party one? It's likely that's the most economical solution.

--- End quote ---

Surprised they weren't more amicable. Good luck with the repair, if all else fails you could DIY or get a better unit.
slybunda:

--- Quote from: NiHaoMike on February 10, 2024, 07:27:37 pm ---I would fit a pair of SPDT relays to the existing car horns, wired so that by default, the horns operate as usual and activating the relay activates each horn individually. Then use a classic 2 transistor oscillator to alternately operate the relays when the alarm is sounding to give a high/low cycling rather than the usual car horn sound that often gets ignored.

--- End quote ---

The alarm doesnt use the car horn it uses its own speaker
AVGresponding:
I think NiHaoMike is suggesting you use the alarm output to switch the car horn via an oscillator/relays.

This of course will only work if the alarm active output still works as it should.

If you need replacement sirens I have any number of old fire alarm sounders, a sample of which you could have for the cost of postage. There are some fully potted piezo types which would probably work best.
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