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Re: my digital tc tuner
Original poster: "claudio masetto" <claudmas@xxxxxxxxxxxxxxx>
Yes Bart, you are right. I use a Bournes pot in my TCT and it is very
well constructed. Very expensive though.
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Saturday, April 28, 2007 3:33 PM
Subject: Re: my digital tc tuner
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Yes, multiturn pots are our friend with a TCT. I use the Bournes p/n
3540S-1-103. This is not a trimmer pot, but a good quality 2W pot.
The power rating is not the reason to use it. It's the mechanical
structure of the pot that makes it perfect for replacement in the
TCT. It's high quality so spendy ($13), but it's worth it and makes
a great replacement for the 10k pot in Terry's TCT (or anyone's
tuner). Terry's pot had a switch off position (audio taper). To use
the multiturn pot, just install a separate little on/off switch.
Tesla list wrote:
Original poster: "CajunCoiler" <cajuncoiler@xxxxxxxxxxx>
10-turn pots are good.
10-turn pots can be our friend. :)
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Friday, April 27, 2007 10:14 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: my digital tc tuner
> Original poster: "claudio masetto" <claudmas@xxxxxxxxxxxxxxx>
> I did the same thing a while back. Works great. Use a 10 turn pot for
> easier adjustment.
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, April 27, 2007 2:30 PM
> Subject: my digital tc tuner
> >Original poster: Ben Buxton <bb@xxxxxxxxxx>
> >Until now, I have been tuning my coil with Terry's TCT and a
> >multimeter to accurately measure the resulting resonant frequency. I
> >decided I wanted to make something a little more self contained so I
> >decided to combine it with a PIC based frequency counter.
> >This is my resulting device:
> >So now I just adjust the dial until the LED goes bright (sec) or dim
> >(pri), then I can read the frequency off the display for <
~1KHz > >accuracy.
> >I used this frequency counter circuit (variant 1):
> >Chosen mostly because it uses an LED display - goes much better
> >aesthetically with a TC than LCD IMHO. :)
> >The main concept involves having both circuits on the one board,
> >then just joining the output of the TC oscillator to the input of
> >the PIC (via a 2k resistor).
> >It's built on prototyping board, so no neat layout, but if anyone
> >wants more details, just ask.