On Thu, 21 Nov 2013 13:25:21 -0500, "Maynard A. Philbrook Jr."
wrote:

In article ,
says...

On Mon, 18 Nov 2013 12:25:28 -0700, Jim Thompson
wrote:

On Mon, 18 Nov 2013 10:30:05 -0800, John Larkin
wrote:

On Mon, 18 Nov 2013 11:14:39 -0700, Jim Thompson
wrote:

On Mon, 18 Nov 2013 09:34:16 -0800, John Larkin
wrote:

On Mon, 18 Nov 2013 09:05:54 -0700, Jim Thompson
wrote:

On Mon, 18 Nov 2013 06:59:03 -0800, John Larkin
wrote:

On Thu, 14 Nov 2013 08:13:54 -0700, Jim Thompson
wrote:

On Wed, 13 Nov 2013 19:30:07 -0800, John Larkin
wrote:

On Mon, 11 Nov 2013 10:49:05 -0600, "Tim Williams"
wrote:

Is J2 the socket for the PIC, or is it going through cables to the PIC
somewhere else?

What are the trace lengths on the loop from Q1 source (ground), to the
nearest bypass capacitor on +12VR, through D5, back to Q1? (Hint: D5 must
be placed at Q1, not at the coil.)

Why? It will clamp a flyback overshoot wherever it is in the circuit.

If the wiring from FET to coil is significantly inductive, then what?

...Jim Thompson


Since you can't think this through, you'll have to Spice it.

No. It's _you_ who'll have to LTspice it... and you'll get it wrong
:-}

...Jim Thompson



Having fun, John?

Jamie

Beating up on Thompson is like clubbing baby seals, but somebody's got to do it.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators