S
Scott Miller
- Jan 1, 1970
- 0
Didn't we tell you how to dump that asinine MOV crap in a previous thread
Yes, I asked for suggestions on replacing the shunt regulator. I got some
great input on using op amps to buffer the feedback signal. Turns out
that's not really the tough part. I've had decent results feeding the MCU's
ADC directly from a voltage divider. The more difficult part is making
sense of those readings and determining how to change the PWM signal.
I agree that the MOVs as a shunt regulator is a POS. Unfortunately just
about every hobbyist design I've ever seen for a Geiger counter uses the
same sort of thing, sometimes using neon bulbs or lots of zeners. I've been
experimenting with using the MOVs to trigger a PWM change because I know
they work, which eliminates one more possible thing to screw up as I start
making changes to the design.
I'm not asking anyone to design this thing for me. I'm just asking for help
understanding what's going on. I've gotten some great feedback on things
like the diode switching speed. I think I'm well on the way to a reasonably
efficient, inexpensive, non-crappy design, and I appreciate all the help
I've gotten here.
Scott
you started about this p.o.s.? -PLONK
Yes, I asked for suggestions on replacing the shunt regulator. I got some
great input on using op amps to buffer the feedback signal. Turns out
that's not really the tough part. I've had decent results feeding the MCU's
ADC directly from a voltage divider. The more difficult part is making
sense of those readings and determining how to change the PWM signal.
I agree that the MOVs as a shunt regulator is a POS. Unfortunately just
about every hobbyist design I've ever seen for a Geiger counter uses the
same sort of thing, sometimes using neon bulbs or lots of zeners. I've been
experimenting with using the MOVs to trigger a PWM change because I know
they work, which eliminates one more possible thing to screw up as I start
making changes to the design.
I'm not asking anyone to design this thing for me. I'm just asking for help
understanding what's going on. I've gotten some great feedback on things
like the diode switching speed. I think I'm well on the way to a reasonably
efficient, inexpensive, non-crappy design, and I appreciate all the help
I've gotten here.
Scott