klehman(at)albedo.net
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 Posted: Fri Feb 11, 2011 2:30 pm Post subject: Aeroelectric-list: Battery disconnect switch |
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Suspect that it would work just fine for many years with a momentary
spring loaded on-off-on toggle switch and no conditioning circuitry.
Ken
On 2/11/2011 3:22 PM, Jan de Jong wrote:
| Quote: |
<jan_de_jong(at)casema.nl>
>> To be able to use it as a normal on-off switch I am thinking of an
>> adapter with 3 input pins - ground, power and switch - and the
>> required 4-pin Tyco plug as the output.
>> Switch to power (from open or ground) would generate an ON pulse,
>> switch to ground (from open or power) would generate an OFF pulse,
>> switch to open (from ground or power) would not do anything.
>> If ever no switching action results when expected: repeat manually -
>> introducing memory and automatic repeat goes too far I think.
>
> Another thought. The coil resistance is stated as 4.7 ohms.
> This translates to a coil draw on the order of 2.5 amps
> while energized. The specs also state 100 mS max for transfer
> pulse. This means that you probably have to device control
> circuitry that LIMITS control inputs to input pulses having
> a fixed and limited duration.
Yes - adapter must have power and ground.
Without having put pen to paper I was thinking of a few parts like:
- R and C for 50ms
- comparator with builtin reference and hysteresis good for automotive Vs
- PNP with emitter resistor for 5A current limit or so
- the odd resistor and diode.
Jan de Jong
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