[minima] Re: band switching
- From: <jerry@xxxxxxxxxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Sat, 08 Feb 2014 23:10:24 -0700
The price is right. about .25 cents on eBay. Jerry
K5LRU
Harwood, Texas
> -------- Original Message --------
> Subject: [minima] band switching
> From: Ashhar Farhan <farhanbox@xxxxxxxxx>
> Date: Sat, February 08, 2014 11:47 pm
> To: minima@xxxxxxxxxxxxx
>
>
> 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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