need time delay for AC circuit
need time delay for AC circuit
(OP)
Hello,
I'm pretty sure what I need is the equivalent of a single shot timer relay. What I want to do is control the "ding dong" sound from a door bell. It operates on 16VAC. In normal operation when the doorbell button is pushed a plunger is pulled into a solenoid and strikes the "ding" bar. When the button is released, the solenoid releases the plunger and a spring pushes it back to hit the "dong" bar.
I want to make it so the solenoid is energized for a set length of time regardless of how long the button is held. The exact length of time is not important (I assume it will be easily adjusted by changing resistance or something) but for now let's figure a 1 second hold time.
Separately, I'd like to also "lock out" the button from being able to reactivate the solenoid for a period of about 10 seconds. Anyone who's had a 3 year old ringing a doorbell will understand the value of this. This feature will probably be on a switch to have it enabled or not.
I'd like to do it with parts I'd solder myself. I'm confident both functions can be done with a simple R-C type circuits but I need help figuring it out.
Thanks.
I'm pretty sure what I need is the equivalent of a single shot timer relay. What I want to do is control the "ding dong" sound from a door bell. It operates on 16VAC. In normal operation when the doorbell button is pushed a plunger is pulled into a solenoid and strikes the "ding" bar. When the button is released, the solenoid releases the plunger and a spring pushes it back to hit the "dong" bar.
I want to make it so the solenoid is energized for a set length of time regardless of how long the button is held. The exact length of time is not important (I assume it will be easily adjusted by changing resistance or something) but for now let's figure a 1 second hold time.
Separately, I'd like to also "lock out" the button from being able to reactivate the solenoid for a period of about 10 seconds. Anyone who's had a 3 year old ringing a doorbell will understand the value of this. This feature will probably be on a switch to have it enabled or not.
I'd like to do it with parts I'd solder myself. I'm confident both functions can be done with a simple R-C type circuits but I need help figuring it out.
Thanks.
RE: need time delay for AC circuit
Conversely, the AC can serve as a clock for digital timer circuits.
I get the impression that some industrial time delays are mechanical.
There are a lot of choices, but the fastest, cheapest one, is the one on the shelf.
Search for 'AC time delay relays', and see what you find.
For instance, a relay designed for 24VAC _might_ work on your 16VAC. Read the spec sheet, or just buy and try.
OR, and you should consider this mostly for educational value, buy an Arduino and appropriate 'shields' to interface with your world. It will cost a little more than a simple time delay relay, but is capable of arbitrarily complex behaviors.
Do not even think about buying bare microcontrollers and associated surface mount components and soldering them together yourself. Doing so requires tiny soldering irons, strong lighting, magnification, ... and you will still burn your fingers and always worry if you did it right.
Mike Halloran
Pembroke Pines, FL, USA
RE: need time delay for AC circuit
RE: need time delay for AC circuit
Keith Cress
kcress - http://www.flaminsystems.com
RE: need time delay for AC circuit
RE: need time delay for AC circuit
RE: need time delay for AC circuit