Yes Fabian you can install the filter inline from the volume control. You will need a SPDT or if switching voltage on and off also a DPDT switch. In any case the audio amplifier input would be connected to the terminal that is switched (usually the center terminal) and the wiper of the volume pot to one of the outer terminals and the filter output to the other terminal. Here is a rough drawing of description.
The LM317 and LM337 are different regulators one is in the positive flow and the other is in the negative side, use the 317 and you don¡¯t need a zener diode just use the resistor divider circuit on the output with a trimmer resistor to ground. You will be able to adjust it for your 10vdc.
toggle quoted message
Show quoted text
On Mar 26, 2022, at 09:35, sdr freak <sdrfreak55@...> wrote:
?
Thank you for your help!
?
I understood that it is now possible to operate the audio CW filter without a relay if I install a switch for the supply voltage, i.e. voltage for filter on/off, for example on the front of the UBitX. That would be the first switch.
?
And now the real thing.
?
I could also install the filter between the path of the line from the volume potentiometer to the audio IC.
And just a switch for shorting the normal volume to audio IC line.
That would be the second switch for filter on or off. Simply installed the switch for CW filter on/off on the front of the UBitX next to the volume potentiometer.
?
If that corresponds to my considerations is it correct, please tell me, I'm a little inexperienced when it comes to all this. But I would always like to build a lot myself, I just find it difficult to understand some simple things.
?
That would also be another question if I may, the supply voltage for the filter must be stabilized at 10V and LM337 and zener diodes and I thought about how to do that, on a stabilized supply voltage for the CW filter.. It's just that I use a battery with 13.5V-12.7V depending on the operation of my UBitX. So I don't have an exact input voltage to calculate something for a Z-diode, is that right? With a LM317/337 I thought it might work, but if I'm honest I can't find the right answer to this 13.5V-12.7V from the battery, which doesn't stay the same, to get a 10V stabilized voltage for the CW filter ..
?
Can you please help me again how to do that with the 10V for the filter without 7810 IC?
?
Thank you for your help!
Skip Davis