I've been messing around with some SSRs lately for a project I'm working on at my laundromat. Right now I have mechanical switches on my coin acceptors. They work well enough but I wanted to play around with a different type of coin acceptor that doesn't use them. This one uses a -8VDC pulse when it gets a coin. It also has the option of being able to accept a second type of coin and you can set the number of pulses. Example one pulse for a $.25 coin and 4 pulses for a $1.00 coin. The electronics in the machine aren't compatible with a -8DVC pulse so I have the pulse going to the - coil on a mechanical relay and the wires that went to the old mechanical switch hooked up to C and NO. It works well enough when you do the $.25 with one pulse, but the 4 pulses for $1.00 come in too fast for the mechanical relay to process and it only credits for 3 pulses or $.75. Tried using some off the shelf SSRs but they only work for switching AC loads. Can't find one for analog signaling. Did some research and am going to try to build with TI TS12A4515PE4 analog switch IC. Should work fine in this application because of the low current involved, but I was wondering if any of you guys knew how to build a SSR that can handle heavier loads of say 5A instead of the 30mA these ICs can handle.
Problem with off the shelf SSR is that they appear to need a load to function correctly. What I'm looking for is a direct relay replacement. Something that gives continuity as soon as the "coil" is energized and takes anything on the output terminals out of the equation.
Problem with off the shelf SSR is that they appear to need a load to function correctly. What I'm looking for is a direct relay replacement. Something that gives continuity as soon as the "coil" is energized and takes anything on the output terminals out of the equation.