need to turn switch on/off at 1 - 5 second intervals

May 08, 2007 3 Replies
R

The subject pretty well defines my quest: need to turn switch on/off at 1 -



5 second intervals

Here's some background; I have a thermoblock that generates steam that is too *wet*. I'd like to mount a valve (solenoid?) between the water mains & the thermoblock that can be opened/closed at varying intervals. Can someone point me toward a VERY cheap way to do this?


Robert Harmon



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B

Generally speaking, things in this power and timing range (1-5 secs, AC Water solenoid) are cheapest when done mechanically. Think motor, cam and microswitch.

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E

Assuming you have a mains powered solenoid:

+12 ---+----------------------------+-------+ |a | | [D1] [Relay] [D2] | | |a +-----+-----------+---+ +-------+ | | | | | | [1K] --------- | | | | 8 4 | | | +--------|7 | | | | | | | | P | 555 | | | O
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B

An equivalent adjustable commercial repeat cycle relay is available for about $54 - may not be "VERY cheap"

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are available 12/24/120V AC/DC and 240VAC for the timer, with isolated contacts.

New solenoid valves might start around $20 - depends on flow rate.

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