Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Thanx for the suggestion. I was hoping it would be something as simple as that but no, everything was installed correctly.
I decided to put the diode across the coil and moved the anode from the gate to the drain. This got the circuit to work - it delayed the relay turning on by approx 5 - 10...
MikeMl, I know this thread is over 6 mth old but I was looking for a relay delay cct and the one you posted seemed suitable. I needed to vary it slightly to suit my application and had to use a 2n7000 FET as it was the only one I could get locally. BTW, the relay coil is 400ohms.
I built it...
Thank you for your help. I just have a few Q's...
How would I shorten the delay of 20secs? Could I put a 2meg pot in place of R1 to vary the timing?
I measured the solenoids current draw - I think they draw 120mA when active, maybe there is a spike when they are triggered which I couldn't...
You suggestion certainly sounds sensible, it's just I have no idea how to do what you are describing.
If I can't get anywhere, I'll do what mneary originally suggested and somehow try to wire it up so it only works in Park. Not sure how though.....
Any feedback on this circuit linked to...
OK, that won't work.
I did some more reading and searching through past posts and came across this thread:
https://www.electro-tech-online.com/threads/notc-relay.90779/
It's a delay circuit for a relay & sounds like it may work for me. Could you please have a look at the circuit in post #6...
This is the idea I referred to in my OP. Pulses come from the hall effect sensor, eventually C1 charges and pin 3 on the 555 triggers the relay.
**broken link removed**
This is probably not exactly what I need but I thought it's a starting point.
Like I said in the original post, "I'm not very knowledgeable in electronics" so maybe what I have in mind isn't as easy as I thought. I tried to describe "in detail" what I was hoping to achieve but I'll have another go at it.........
There are 2 x Hall effect sensors, mounted one above the...
Currently it's a manual system with switches. I'd like to automate it.
I don't want to put the new sensors too far apart as it will not trigger untill there is too much weight in the truck. I was thinking the chassis would move no more than 5 mm before the sensor would activate the valves to...
Sure, sounds OK to me.
But what about the actual circuit design to make the "adjusting system" work? Does what I proposed with the hall effect switch & the timer sound possible?
Hi Guys
I'm not very knowledgeable in electronics and would love some help. I did a quick search here but no luck.
It's not really active suspension. What I have is an air-bag rear suspension system in a light truck. There is an on-board air compressor and tank. There are solenoids that...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
