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lingyueqing

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About lingyueqing

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    Audio

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  1. I'm relatively new to electronics, and have no formal training other that what I picked up through my electrical engineer father. I solder well, can read schematics, have assembled kit projects with a rough understanding of how all the parts work, and know basic electrical terminology and principles. Ohm's law is about as far as my electical math skills go. Now I 'm reading some articles in this blog: http://www.apogeeweb.net/ So while this may seem like a very basic question to a more experienced and better trained person, please bear with me. I spent a couple weeks messing around with some LEDs. I started by just hooking one up to my power source. Then, what happens when I add a resistor? What about a capacitor? what about resistors in parallel vs. series? From just playing with my breadboard, I now have an LED that blikcs randomly. Impressive? Nah...but I figured it out myself, and feel that I truly understand it. Now, I want to design a synthesizer from scratch to give myself an understanding of how specific components affect sound. Starting from the most barebones circuit that can make a noise, I want to add a pot, then some capacitors, then some 555s...you get the idea. I just want to start with the basics and play around to see what happens. Finding that circuit is proving to be quite difficult. I'm looking for a circuit more complex than hooking a speaker directly to a battery but less complex than http://www.musicfromouterspace.com 's Wacky Sound Generator (which, while simple compared to a real synth is still a lot more complex for me to truly understand what component A vs. compoent B does). In essence, I want to find the sonic equivalent of Battery-to-Speaker and start playing with what can happen in between. Electronics golf: what can produce sound with the minimal number of components?
  2. I have recently been fascinated with wireless-ness. I thought of a little project so I could do a little research in this area. This project uses a circuit board found in a Christmas card or birthday card that makes it play music when the card is opened. It will also use an RF transmitter and receiver. What I am aiming to do is wirelessly transmit the music from the sound circuit to a speaker via the RF transmitter and receiver. Parts bought from kynix I plan to use: RF Link Transmitter (315 MHz) - http://www.kynix.com/Detail/12059/ATA5774-PXQW.html RF Link Receiver (315 MHz) - http://www.kynix.com/Detail/9279/TDA7511.html Music Circuit (something similar to this link) - http://www.ebay.com/itm/230761780701 Original circuit: Music circuit -> Speaker New circuit: Music circuit -> RF transmitter -> RF receiver -> Speaker What I'm looking to do is cut the wires of the speaker and attach the circuit board to the RF transmitter. And then attach the speaker to the RF receiver. I'm assuming I'm going to need some sort of buffer attached to the receiver. Is there any sort of hardware buffer I would be able to use or would using a buffer through code be easier? Music circuit -> RF transmitter -> RF receiver -> Buffer -> Speaker Another thing I'm worried about is the data I will be sending. Would I need an analog to digital converter to change the original signal (that was sent to the speaker itself) to a digital signal for the RF transmitter to transmit correctly? And then would I need to change that signal back to an analog signal? Music circuit -> ADC -> RF transmitter -> RF receiver -> Buffer -> DAC -> Speaker Would this be a practical solution? I know using 2 arduinos would probably be easier, but I want to eliminate the use of micro controllers and code, and focus on the hardware and circuit analysis of the system. Also, I'm using the RF link transmitter and receiver because they are cheap and I want to focus on how the signal is created, sent, and received.
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