[EMS Discuss] HIgher current H-Bridge and circuit help

Sat Apr 6 11:44:43 PDT 2013

I have a dual relay that I am not sure if it will work or not, never used
relays before actually... here's a link to one similar to it:

On Sat, Apr 6, 2013 at 11:12 AM, Taper Wickel <EMAIL HIDDEN> wrote:

> My quick reaction is to go with relays -- and on consideration, that
> original switch is probably just a DPDT wired with each "throw" inverted.
> Er, reading that back, maybe this page will make things clearer:
> http://www.engineersgarage.com/electronic-components/dpdt-double-pole-double-throw-relay
> What you lose, compared to an H-bridge, is the capacity for speed control,
> but in this application it doesn't sound vital.
> Hope this helps!
> Taper.
> --
> Taper Wickel <EMAIL HIDDEN>
> Hi all!
> I hope someone may be able to help me to decide what direction to take a
> project that semi-works but doesn't complete the goal set out.
> I have a chicken door opening mechanism built using an electronic
> screwdriver powered from 4 AA batteries, it has a spool on the driver area
> and it winds up a rope that pulls up the door through a pulley system. The
> switch on the screwdriver is a weird type that throws both negative and
> positive at once and then reverses that for the other direction, thereby
> avoiding the need for any IC or control. The way we operate it is to hold
> the button while the door goes up or down and release it when it is in the
> correct spot. This all works fine and has been in place for a while.
> However now that it gets light earlier I have built a circuit that will
> automatically open the door when it gets light. It uses an H-Bridge to
> control the motor instead of the direct connection to the batteries as
> before, which worked great in testing with a motor with no load on it,
> however once I built it all and tried to put it in place the current of the
> H-Bridge(600ma) was not enough to open the door at more than a snails pace.
> My question is: should I continue to look for another higher amperage (to
> let all the juice from the batteries through would be a much higher
> amperage, like 1 amp)H-Bridge with a similar pinout layout or try to use
> relays to switch it, or try to use some transistors to do it?
> Thanks for any help!
> Cord
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