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Bell Ringing (or Light Flashing) Circuit Answered

There's a dead simple circuit which I've built before, but can neither remember, nor find online. Just a capacitor, relay, and a few resistors to make a circuit which flashes on + off.

Can anyone here find this, or re-recreate it?

Discussions

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Downunder35m

2 years ago

You mean something like this?

simple relay flasher.gif
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Toga_DanDownunder35m

Reply 2 years ago

yes. I think that's it. Thx, du35m. The pic is slightly amputated, but that's it. Positive to the top left lead, and, ummm...

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Downunder35mToga_Dan

Reply 2 years ago

When you click on the image you get the full size.
Ask Autodesk why they chop pics we add here ;)

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Yonatan24Downunder35m

Reply 2 years ago

I know that there's some kind of circuit where you power a relay. It might be your schematic.

You have to give power to the relay, and it turns itself off immediately, and on... and off... Really quickly.

Then you put resistors or capacitors (Not sure...), and it makes the realy turn on and off slower.

I have no idea...

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Toga_DanYonatan24

Reply 2 years ago

yeah. I think that for a Buzzer, you don't need caps and resistors, but to slow it down for a bell, blinker, whatev, that's when you need em.

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Downunder35mYonatan24

Reply 2 years ago

I have done that as a kid for a simple "electrocution device".
If you connect a NC contact in series to the power supply for the coil it produces a very fast switching and in return a nice bit on your fingers if you touch it.
So I would assume if you add a capacitor to the NO contact it will delay the opening until charged up enough.
Another cap on a different contact can serve as a "battery" to keep the relay on for a very short time if it is switched in parallel to the coil when active and parallel to the battery when not.

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Toga_DanDownunder35m

Reply 2 years ago

yup. I did a shocker once with this. 9V battery supply. Relay/cap circuit supplies chopped DC to the secondary(now acting as the primary) of a wall wart, and ba-bing-120v output.