Hi,
I have the split load on my 2nd stage. With separate coupling res. (0,1µF/82k, 2n2/100k).
As long the caps are not fully loaded, there´s a huge plop when switched (depeds of the frequency of switching ).
How can I solve that problem? With 2x100n caps over the switch lugs? Or with 1M res to ground?
Probably the best would be a relay and 2m2 to ground at the unused side, I guess. But this would need another small iron for the 5 or 12 VDC. Not shure that my heather wireing could stand this additional circuit. Its now at 6,2 V!
Lately I tend to use mosfet relays like Mouser Part No: 769-AQW654 . No moving parts and you can operate the led side with virtually anything between 2 and 5v
The one switching my K50's split load is a traditional 5v relay ( Mouser Part No: 653-G5V-2-H1-DC5). I used it because I wanted a dpdt relay for switching in an out a cathode bypass cap when changing plate load and because the mosfet relays I had left were 300v rated, while plate voltage was 390v ( I fried a few before I realized what was going on)
By the way, for those changing plate load with a tiny switch, be careful with the switch's voltage rating...
You have two coupling caps, both of them with one side connected to high voltage. Simply connect the other two sides of the caps with a 2M2 resistor (anything above 1M is ok).
This will keep the ground voltage avoiding any pop.
roberto wrote:You have two coupling caps, both of them with one side connected to high voltage. Simply connect the other two sides of the caps with a 2M2 resistor (anything above 1M is ok).
This will keep the ground voltage avoiding any pop.
Hello Roberto:
you mean BETWEEN the two AC sides one 2m2 res, or with 2m2 from each cap to ground? And iF - at the sitch or direct at the caps? For the moment I use a normal switch.
@ Pablo: this AQW switching parts are really cool! No moving parts means no plopping! I have to organize some of them. Although for this (meantime a K50 variation like yours) I would need a separate 6V iron.
About the tiny switch: there is no DC voltage more, I use on both sides a coupling cap.
Both caps have one side connected to the plate of the previous stage.
Put a 2M2 resistor to connect the other side of the two caps. This will keep that side of both caps references to gnd.
I suggested 2M2 because it won't affect the sound, but you can decide to lower that value to something around 220-470k to obtain a frequency shape.
That's a good way of doing the fast/gradual mode because you are not switching DC (switch is downstream of the caps) and you can change the coupling caps to suit your taste.
Not sure, but shouldn't your capacitors be connected one position closer to the plate? The way you have it, I think that the upper one is just listening to B+.
).
