Hi, Cecil. Thanks for the message.
The latching relays I used are NAIS TQ2-L2-5V. If you look closely
at the picture I posted in the files section, you can actually read
the part number. These are in a 10 pin DIP package. I took a 20 pin
dip socket and carefully cut it in half to make 2 10-pin sockets.
This particular relay is DPDT, and has two seperate coil windings.
Pulsing one coil sets the relay in one position, and pulsing the
other coil resets it to the other.
I obtained ten of these from eBay some time ago, but a Google search
reveals that Newark has them at $2.73 each in small quantities. They
may also be available elsewhere. Here's the link to the Newark page:
These are true latching relays. all you need do is provide a pulse
of 5volts to the coil to trigger them, then they stay in the state
they were set to. I used an FET to control them. The FET only
conducts briefly when the band switch is moved. Then the FET turns
off, so no relay coil current flows after that.
The entire multiband SoftRock only consumes 16mA steady-state.
GL es 73,
Bruce N1RX
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--- In softrock40@..., KD5NWA <KD5NWA@c...> wrote:
Where did you get the latching relays, and what are their numbers.
I
have several projects that could use latching relays. Hopefully
they
are affordable, the ones I have found are very pricey ( > $10) Are
they true mechanical latching relays, that will keep the settings
with no power?
