My RS-35M came with the negative terminal connected to the chassis
internally. This is not shown on the circuit diagram.
I have also made the internal modification of adding a 10k resistor in the
input signal line to the 317 regulator chip. I float a 110 AH RV battery
across the supply in the manner of a UPS using a 20 amp circuit breaker.
73/72/oo, George W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765 #02437
Mike Hyder -N4NT- wrote:
>
> If you do not have the negative output post grounded directly to the cabinet
> of the Astron, then all sorts of spikes can hit the regulator and damage it.
|