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Re: Terry's DRSSTC - All Ready!!

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Gerry,

At 10mA (twice what I need) I measure the forward drop of the 1N5819 at only 0.26 volts. So I have 40mV to spare ;-)) The level does not need to be exact at all and as long at it works reliably. I am also running out of room on the card these days too. But using the Schottky diodes seems to fix the LM339 up fine! Zero problems with the circuit now!!



At 11:55 PM 3/3/2005, you wrote:
Hi Terry,

If you tie the anode side of D3 and D4 to a +0.6V reference (made with another matching diode and resister), you can clamp at precisely 0V.

Gerry R.

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

I also took on board (literally- I'm laying out a PCB) what Terry said about
putting the burden resistor back on the driver board and transferring the CT
signal as a current. I think I'll include that as an option on the board.

Here is how my newest one looks:



I do all the heavy current stuff for the CT in the lower right...