• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

How do I make a relay pickup slower?

C

CaptBob92

I'm interfacing a Bluebox to some Radio Shack relays and have run into a problem. The Bluebox has two single pole closer outputs. The first closer is closed and maintaned all the time the two boxes are talking. The other is momentary and originated by the box at the remote. The problem is that momentary closer closes for a split second when the first closer happens. My outboard relays are too fast and react to this quick momentary contact when closer one closes.

What I need to do is add something that will cause my relay tied to the momentary closer to takeup slower and thereby ignore the short closer from the first relay. I understand this can be done with a cap and resister .Anybody got any ideas ? a schmatic?

Voltage is 12 volts DC. Relays use about 40 mills
Thanks in advance
 
I would start by placing a resistor in series with the relay coil - use the highest resistance that will continue to operate the relay reliably. Then place a capacitor across the relay coil (with the resistor still in the circuit) - one large enough that will filter out the pulse from the first relay and small enough to minimize the delay. Watch the polarity of the capacitor as it will need to be an electrolytic and probably be at minimum 10 uF.
 
ncradioeng has it. Use a small resistor, and large capacitor. Be sure you have a diode reverse polarized accross the relay to keep it from haning on.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom