Timer circuit/relay/solenoid gong machine

[sylvanite]

Hey all,

I'm coming to you with a simple circuit question - I know a little about EE from using Arduino, but not enough to have a glimmer of competency, so I really appreciate your help.

To clarify - I don't need a schematic, I just need a general solution. I can do the dirty work if I can just get some help figuring out where to start.

I'm working on an analog timer circuit that's going to be driving a solenoid eventually (it's whacking a gong). Here are the specifics:

- All analog, 24VDC source
- Variable timing ability of ~3 seconds - 1 hr (+/- 10%; thinking 4060 or 556?)
- I was thinking two timing modes (3 sec - 1 min, 1min - 1 hr) with a selectable switch. Could be interpreted as a "short" mode and "long" mode.
- Accurate to seconds is preferable, most important aspect is accurate regular intervals
- When the timer fires, I need an exact 70ms ON pulse to the solenoid (555 monostable?)

I know I can use a 555 to send pulses to something like a 4060 - the issue is getting the ranges I want.

TL;DR: How do I send a 12VDC 70ms pulse to a relay at regular intervals with variable timing between 3 seconds and an hour?

Thanks for your help!

-Nate

 

[dr pepper]

Welcome to the forum.

To do what you say an arduino if you can program them is probably the most practical way.

By any chance is your name natehall?