Crystal Radio Coil Sizing--Real Examples (4K)
Responding to questions and comments regarding various options on the commutator from variometer series of videos.
Brush set for small motor/small variometer:
RS550 Electric Drill Motor Carbon Brush Holder with Copper Brush Replacement for RS550 RS555 RS545 Motor Accessories.
These were less than a dollar for 2 sets!
I bought a Model AMT-MW207 v 1.32 dated 20230614 AM radio transmitter to demo and test my "mineral" (crystal) radios. Thought it would save me copyright troubles since I could avoid the commercial airwaves for demos.
It's not bad, BUT it's not crystal stabilized so the frequency does drift a bit and its output is very, very limited. Google translated from the instructions: "Radio only has a good effect in the desktop range." About 1 meter. It does not list a specific power output.
Crystal Radio Coil Sizing--Real Examples (4K)
Responding to questions and comments regarding various options on the commutator from variometer series of videos.
Brush set for small motor/small variometer:
RS550 Electric Drill Motor Carbon Brush Holder with Copper Brush Replacement for RS550 RS555 RS545 Motor Accessories.
These were less than a dollar for 2 sets!
I bought a Model AMT-MW207 v 1.32 dated 20230614 AM radio transmitter to demo and test my "mineral" (crystal) radios. Thought it would save me copyright troubles since I could avoid the commercial airwaves for demos.
It's not bad, BUT it's not crystal stabilized so the frequency does drift a bit and its output is very, very limited. Google translated from the instructions: "Radio only has a good effect in the desktop range." About 1 meter. It does not list a specific power output.
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