[minima] Re: band switching
- From: Ashhar Farhan <farhanbox@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sun, 9 Feb 2014 12:17:47 +0530
sudarmanta,
you won't know which band you were on. so, each time you want to transmit,
reset and then pulse it enough number of times so you are on the correct
band.
- f
On Sun, Feb 9, 2014 at 12:06 PM, Sandeep Lohia <sandeeplohia12@xxxxxxxxx>wrote:
> why burn extra energy in relays??? they always ON !
>
> here using something like : (see attachments)
> it's just mine is MIL-RECYCLED, (air-wound properly angled)
> hope pictures say complete story :D
>
>
>
> On 09/02/2014, Ashhar Farhan <farhanbox@xxxxxxxxx> wrote:
> > here's another idea:
> >
> > use a CD4017. the 4017 has upto ten outputs. only one goes high at a
> time.
> > as you pulse the clock input, the high moves to the next pin.
> > so, what you do is this :
> > 1. Use one pin to reset the CD4017 (the high moves to the pin'0').
> > 2. generate low to high pulses to move the high output to the desired
> band.
> >
> > as the CD4017 outputs a high, you can use this to drive a 2N7000 to
> switch
> > the relays. the 2N7000 has built-in diode to prevent the flyback surge.
> >
> > - f
> >
>
>
> --
> --
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>
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