Hello I am learning electronics and ive built a simple foxhole radio. I amplified the radio signal with two transistors, one using 1.5v and the other using 3v I was just woundering will the output voltage be 4.5v or 3v im not sure and I havent got a voltage meter please help.
first excuse me for not knowing much of crystal radios which i'm starting to get into. crystal radios need no power like a batt or ect but they lack amplication... is it possible to hook up a series of crystal radios to get enough voltage etc to run an amp to power a separate crystal radio to be able to make it louder instead of using traditional electricity to power it? wondering if this is possible.
To be honest, I don;t think so, your first crystal radio has of course rectified the incoming signal, so you then have audio, you could run the audio through a cascaded AF amp. but as a crystal radio does not amplify 2 or more radios could not be cascaded to any advantage.
You could try ether constructing a RF amp the output of which would connect to the receiver. or perhaps try an active antenor, (same deal really, latter is just a broadband RF amp in essence)
@rockymountainradio but it can worK, if in the cascade the diodeof the first resonant circuit is replaced by a <300 pf capacitor, it wont amplifies but increase the Q of the resonant circuit, so it can reject the adjacent radio stations.
hi can you post a video for making a crystal radio without the need for batteries.. i thought it was possible as long as the speaker is not amplified coz amplifier requires power.. thanks.. it would be highly appreciated...
hi. a wavetrap in this instance is a filter circuit that is placed across the input (antennor) terminals of the receiver and is usually tunable, it would be a series resonent circuit that would act as a low impedance to the unwanted signal,
(usually a radio station in close proximity to ones house)
it would of course present a high impedance to all other signals allowing them to pass, you nead another coil and tuning cap to build it, IE 100 turns, and 200 pf
I still use hi z phones but need the radio shack amp for the videos. I built a set of piezo phones found on Dave Schmarder's site. I like 'em Even Better
We're Gina need this one in the apocalypse
Conlan0215 3 weeks ago
This must be how the professor fixed the radio on Gilligans Island
BADDOOKUS 4 months ago
I can finally use those toilet paper rolls I have been saving.
sailorvenussun 1 year ago
Sweet radio would love to make one like it
lilrubberducky2 1 year ago
is it possible to make one without enamel wire?
fishtankbank 1 year ago
im gona make a box and just ol dparts from a shit radio to make mine cuas this looks like it will fall apart if u move it to much
hitachi654 1 year ago
Hello I am learning electronics and ive built a simple foxhole radio. I amplified the radio signal with two transistors, one using 1.5v and the other using 3v I was just woundering will the output voltage be 4.5v or 3v im not sure and I havent got a voltage meter please help.
nicholasgonzalez 2 years ago
first excuse me for not knowing much of crystal radios which i'm starting to get into. crystal radios need no power like a batt or ect but they lack amplication... is it possible to hook up a series of crystal radios to get enough voltage etc to run an amp to power a separate crystal radio to be able to make it louder instead of using traditional electricity to power it? wondering if this is possible.
obsidian231 2 years ago
To be honest, I don;t think so, your first crystal radio has of course rectified the incoming signal, so you then have audio, you could run the audio through a cascaded AF amp. but as a crystal radio does not amplify 2 or more radios could not be cascaded to any advantage.
You could try ether constructing a RF amp the output of which would connect to the receiver. or perhaps try an active antenor, (same deal really, latter is just a broadband RF amp in essence)
rockymountainradio 2 years ago
@rockymountainradio but it can worK, if in the cascade the diodeof the first resonant circuit is replaced by a <300 pf capacitor, it wont amplifies but increase the Q of the resonant circuit, so it can reject the adjacent radio stations.
iskanderoelmann 10 months ago
That is a very nice crystal receiver. Its the first one I have heard demonstrated with a wavetrap. The quality is superb. J.
vinylseat 2 years ago
Tök jó , Circuit diagramm? Pls!
Pujc 3 years ago
can i ask for a schematic?
zezimashock 3 years ago
hi can you post a video for making a crystal radio without the need for batteries.. i thought it was possible as long as the speaker is not amplified coz amplifier requires power.. thanks.. it would be highly appreciated...
surferchique 3 years ago
Can you send me schematic please?
I've made one too but i like your project!
flag6000 3 years ago
could you explaine me what wave trap is?
zezimashock 3 years ago
hi. a wavetrap in this instance is a filter circuit that is placed across the input (antennor) terminals of the receiver and is usually tunable, it would be a series resonent circuit that would act as a low impedance to the unwanted signal,
(usually a radio station in close proximity to ones house)
it would of course present a high impedance to all other signals allowing them to pass, you nead another coil and tuning cap to build it, IE 100 turns, and 200 pf
rockymountainradio 3 years ago
cool :)
i am into elecktronic's that is why i asked :)
zezimashock 3 years ago
i heard "Car Talk"!!!
upsidedownsoup 3 years ago
Tune in a numbers station....
ANARCHYdashTVdotCOM 3 years ago
I remember how great my first crystal set sounded through Hi-Z headphones. they're hard to find these days I think. Nice demo anyway.
G0IFI 3 years ago
I still use hi z phones but need the radio shack amp for the videos. I built a set of piezo phones found on Dave Schmarder's site. I like 'em Even Better
cranelift 2 years ago
Cranelift, Neat xtal set! Sounds really selective too!
Great vid!
John S.
jstrunck 3 years ago
Nice video
toomyg155 4 years ago