10-06-2024, 04:18 PM
Also two shots of the stupidly cheap panel meter (Under £4 inc VAT and postage etc).
The currents are fictitious as removed the 10A shunt. 10K across input and 100K in series. Without the 10K it goes to about 62, i.e. full scale.
0.2V
and 10.7
So volts can be x10 (it pops out of bezel so I can blank Volts decimal point) and current can be mA
Also scary lab bench with over 700V DC at very low power and 350V at maybe up to 20W. Also -145V.
Unless you are experienced, don't do this. Instead assemble my finished design on chassis in a box. There is a slight mitigation that nothing is earthed and it's isolated to 4 kV, so like a bird sitting on HT grid, you are fine only touching ONE place if it's live. It's "live" for a while after power off till the bleed resistors have done their job.
Visible is the small LED voltmeter for -HT and the 100K pot for 0 to -95V. I think I'll add a 1/4 LM3900 or similar to change the voltage to a 1/10th positive version.
Weird filenames as I used Viber chat on WiFi on phone to send photos to workstation Viber "My Notes".
The currents are fictitious as removed the 10A shunt. 10K across input and 100K in series. Without the 10K it goes to about 62, i.e. full scale.
0.2V
and 10.7
So volts can be x10 (it pops out of bezel so I can blank Volts decimal point) and current can be mA
Also scary lab bench with over 700V DC at very low power and 350V at maybe up to 20W. Also -145V.
Unless you are experienced, don't do this. Instead assemble my finished design on chassis in a box. There is a slight mitigation that nothing is earthed and it's isolated to 4 kV, so like a bird sitting on HT grid, you are fine only touching ONE place if it's live. It's "live" for a while after power off till the bleed resistors have done their job.
Visible is the small LED voltmeter for -HT and the 100K pot for 0 to -95V. I think I'll add a 1/4 LM3900 or similar to change the voltage to a 1/10th positive version.
Weird filenames as I used Viber chat on WiFi on phone to send photos to workstation Viber "My Notes".
