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What is the cheapest, simplest component or device that once receives power will wait approx. 1 second before outputting that power, like a delay relay.

It can be any small DC voltage as it will power a another 240 solid state relay, I just need that one sec delay? Can any single component achieve this?

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  • \$\begingroup\$ That is a very common industrial component called a "time delay relay". Industrial and "cheap" do not necessarily go hand-in-hand though some Asian devices are quite inexpensive. \$\endgroup\$ Mar 26, 2021 at 22:05
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    \$\begingroup\$ Incidentally the surge when your compressor comes on could be more than 1 second long. Ideally you should start the second compressor when the first has reached steady load. \$\endgroup\$
    – K H
    Mar 27, 2021 at 0:56
  • \$\begingroup\$ Yeah, what KH says, use a current relay to detect when the compressor has started. \$\endgroup\$ Mar 27, 2021 at 3:07
  • \$\begingroup\$ Regarding your deleted non-answer and your abusive comments you should take the Tour to learn how SE sites work and why your non-answer was inappropriate and why it was deleted. Some of the content belonged as an update to your question - not as an answer. That's how the site works and the downvotes reflect that. Being rude to those who give freely of their time to help you is not a good strategy. \$\endgroup\$
    – Transistor
    Mar 27, 2021 at 11:13
  • \$\begingroup\$ where the hell was I being abusive ??? I was clearly greatful for all or any comments I always am even if I dont agree Im never abusive. WTF I dont get it? Please tell me what did I say then.. I just Thanked the members for there input, especially Seikku who took the time to explain a component setup for me even tho its over my head, so tell me where was I ever abusive? \$\endgroup\$
    – Mamba76
    Mar 27, 2021 at 11:17

2 Answers 2

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Try your favorite china supplier and look for an on delay relay, they are only a few bucks, some are fixed some are adjustable. Normally open, on-delay timers start timing when the input voltage (power) is applied. The output is energized at the end of the delay. Input voltage has to be removed to de-energize the output and reset the time delay relay. You can use google and try searching for "on delay relay" and click on shopping to find them for sale.

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If you are looking for about 1 second on-delay, how about an RC delay? The input of a DC-driven SSR is a LED with about 1 kilo-ohm resistor in series. It should go "on" at less than 3 volts. If you charge a 10'000 µF capacitor through a 100 ohm resistor from 5V, you reach 3 volts at about 1 second. Driving from higher voltage would need a higher resistance.

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