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DIY-How-To Hack A Retro Old Phone To LED Unit & Audio Amplifier

New Edition with Narration: DIY-Hack A Rotary Old Phone To LED Unit & Cellphone Audio Amplifier. this is the link for the PDF schematic printable: Here is the text of the Narration if you might have problem understanding my accent or pronunciation: Narration Script of the Rotary Old Phone Hacked to LED & Amp unit. in this project from Samimy productions, i am going to show you how to hack a rotary old phone and turn it to something interesting and useful. ------------------------------------- after opening the case and the handset, we find out there are enough room to receive LEDs, switches, the amplifier and so on. ------------------------------ it is very easy to cut the wires and drill some circles on the handset by the size of 5mm in diameter, depends on the size of LEDs that you might use. ---------------------- for this project i used 10 white LEDs on each of the sets, the speakers and the mic. --------------------------------------- these LEDs have a drop down voltage of 3.4V each and i am using resistors also to prevent over heating the LEDs, ---------------- Each resistor is about 20 ohms. they would let only 20mAmperes of current through LEDs to save batteries. ---------------- then i found a pair of these black small speakers in my junk box, they are actually from an old pc monitor. ------------------ another set of holes to be drilled on each side of the phone-housing, to let the sound out loudly. ------------- the amplifier is from an old 3V sony cassette player. ----------- it fits inside the phone-housing very well, cause there is enough space for it. ------------ with this yellow wire i am short circuiting the little relay which gets activated by pressing the play button. -------------------- the batteries are from my old broken cell phones that still work fine and gets fully charged. ------------- giving them some spacing here, and the connection of the batteries are in parallel. --------------- enough space again for our little batteries there, as long as it fits there. ------------- the handset switch has got contacts as we connect LEDs Power circuit rout to it, it works fine to turn on and off LEDs while picking up the handset. -------------- this is the schematic diagram that i designed for this project, it is available also on a PDF format, black and white, for download and print. --------------- on the schematic, those yellow circles are all junction points. -------------- each battery is 3.8 volts. -------------- could be useful for study or reading a book at night, also easy to hang-up the phone, i mean the LEDS. ------------------------ meanwhile you can let a song to be played from your cell phone and gets amplified by the phone amp. -------------- so here once again i connect my cellphone to the input Audio Jack of the amplifier and let it to play a song. ---------- now a song is played but due to copyright issues, i have muted the sound. ----------------- turning on the little amplifier switch. ------------- and this adapter charges back those batteries inside the phone-housing. as long as there are protection cut-off circuits inside the charger, we don't need to worry about over charging cause it turns off the circuit automatically once the batteries are fully charged. ----------- This hack provides some useful issues, for example we can read books at night using our old lovely retro phone, meanwhile using the phone as a mobile or any cell phone audio amplifier, the quality of the amplified songs would be depending on what type of amplifier you will use inside the retro-phone. Usually strong amps which are bigger in size cannot be fit inside the phone, but small ones are getting into. I used an amplifier taken from a SONY cassette player 3V stereo. I hope you like this project also visit my channel for my hack and how to projects here:
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