Electronics > Projects, Designs, and Technical Stuff
How to drive latching relais ?
Simon:
Well you can drive this off a micro-controller with 2 small N channel and 2 small P channel MOSFET's, you can use the N channel in each pair to drive the P channel.
capt bullshot:
I did this on a regular basis using the outputs of a 'HC595 shift register (the relays were single 5V sensitive coil), and a 100uF capacitor in series. Up to eight relays driven by a single IC, but one should not switch more than one at the same time. Wait a few ms until the next relay switches, to not create too large peak currents within the 'HC595 circuit.
There was quite an amout of relays involved within the device, so at power-on there was a storm of clicking noise while the software switched all the relays on and off again to bring them into an known position.
Kleinstein:
With some relays, especially the smaller, more sensitive one it may work directly from a 5 V powered 74HC595 with a series capacitor. It may need some 15 mA, but this can be OK for just 1 channel for a short time.
It may not work wit all types though.
Simon:
i think the one used is 9V? 5V may be a little low, why not use the 5V version but this does want 30mA
Calvin:
Hi,
here“s a simple discrete circuit for a 12V TX-S Panasonic relay (2 diodes, Resistor, Cap and Transistor).
The Cap may be chosen considerably smaller in value,depending on the current demand of the relay.
regards
Calvin
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