Re: my digital tc tuner

["Tesla list" <tesla@xxxxxxxxxx>]

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.

Claude.
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <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.
>
> Take care,
> Bart
>
> 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.
> > >
> > > Claude.
> > > ----- 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:
> > > >
> > > >http://au.cactii.net/~bb/tesla/dtct.jpg
> > > >
> > > >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):
> > > >
> > > >http://www.qsl.net/dl4yhf/freq_counter/freq_counter.html
> > > >
> > > >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.
> > > >
> > > >Ben
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >