Ed Like you I don't like dangling pots either. But since I had the system open I took a look to see how hard that would be to accomplish. The pots on the digital counter and its actually quite small. The 3 leads all fit into an area about the size of a pencil eraser. To work on it requires removing the front panel. Decided to leave that alone. To risky. The systems all re-assembled stable and working about the way it always has. I did go with Bobs suggestion using a different synth count and the lower cfield current. Regards Paul. WB8TSL
On Mon, Dec 7, 2020 at 1:12 PM ed breya <e...@telight.com> wrote: > OK, I see now what the circuit looks like, in the manual. The pot is > used in rheostat mode, so the specific value is needed, and it would > take some more modification of the circuit to increase the setting > resolution. > > I would recommend making a simple change to the existing pot hookup > though, which is to tie the "NC" end of the pot to the wiper - I have > this thing about not leaving dangling ends on pots used as variable > resistors. The most likely possible failure mode in a pot is an open or > intermittent wiper. In this circuit, if the wiper should open for some > reason, the circuit will go open-loop, and self-limit at around 13 mA > through the coil (or somewhat less if the coil's resistance is higher > than 700 ohms or so) - twice the normal maximum setting, or four times > the power dissipation. I don't know if this matters here, but for higher > reliability, tying that pot's loose end to the wiper will ensure that > this can't happen - the circuit will limit at the maximum of the normal > adjustment range. > > Ed > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
