Re: 100W Automatic Antenna Tuner...
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At 28 dollars, this looks like a steal. It would be best to rewrite the code for arduino for this group. It should be a simple task. I have used a similar setup earlier.
There were a few challenges:
1. The relays have 300 ohms coils. Together, all of them can consume over 12/30 = 350ma of current at all times. To save on this, you need latching relays. With them, the current can drop to less than a milliamp.
2. The relays must be of top quality as they will chatter quite a bit.
The way out is a little more elaborate:
A. Use a variable cap with a servo. Servos are cheap, capacitors are not.
B. Use high voltage FETs to short the inductors.
On Tue 22 Sep, 2020, 9:06 AM Shirley Dulcey KE1L, <mark@...> wrote: