mstechca
New Member
My superregen is nearing completion, but I have found something interesting.
All detectors have a pull-up or pull-down resistor of some sorts (to deliver power to the entire detector). In transistor FM transmitters, I think the supply resistor is connected between emitter and ground. It is "this" resistor that changes the result of the entire receiver.
Here is what I have done:
I tried 6VDC of power, and used a 27K resistor. I get alot of noise, and maybe one or two stations if I am lucky.
I changed the power source to 3VDC and I get a station in nice and clear with no distortion at all. In fact, this station is about 60 km away from me.
I changed the voltage to 6VDC and changed the resistor to 47K. The station remains clear.
This makes me think that there is a limit to the current an FM detector can deal with.
Because I want good quality like I had, I want to be able to use a battery and have the receiver run until the battery drops under 3V.
Since the resistor has a big impact on my reception quality, is there a circuit out there that automatically selects the right current to output to the detector, based on input voltage?
Oh by the way, when I tried 47K resistor with 3VDC, I got absolutely nothing.
All detectors have a pull-up or pull-down resistor of some sorts (to deliver power to the entire detector). In transistor FM transmitters, I think the supply resistor is connected between emitter and ground. It is "this" resistor that changes the result of the entire receiver.
Here is what I have done:
I tried 6VDC of power, and used a 27K resistor. I get alot of noise, and maybe one or two stations if I am lucky.
I changed the power source to 3VDC and I get a station in nice and clear with no distortion at all. In fact, this station is about 60 km away from me.
I changed the voltage to 6VDC and changed the resistor to 47K. The station remains clear.
This makes me think that there is a limit to the current an FM detector can deal with.
Because I want good quality like I had, I want to be able to use a battery and have the receiver run until the battery drops under 3V.
Since the resistor has a big impact on my reception quality, is there a circuit out there that automatically selects the right current to output to the detector, based on input voltage?
Oh by the way, when I tried 47K resistor with 3VDC, I got absolutely nothing.