** The easy solution is to protect the meter movements with back to back
3a diodes across the movements themselves. Protecting the shunts
requires some knowledge of polarity at the shunt, understanding that Si
diodes Begin to conduct c. 0.5V, as well as knowing basic Ohm's-Law.
>Comparing grid and plate current metering circuits of the SB-220 and AL-82 I
>find the AL-82 grounds the negative side of the plate meter. Trying to
>how to install the metering glitch diodes is a bit confusing here. Of course
>Ameritron's idea of an amplifier schematic doesn't make things any easier to
>Can anyone give me some help as to where to physically (electrically that
>put these diodes. I can understand the one across the grid current shunt
>resistor but I need help with the three in series from -HV to ground.
>Is there by chance a schematic of the AL-82 that incorporates all the sub
>in one print?
>Thanks in advance.
>73, Don, W6OA
>Amps mailing list
Amps mailing list