The rosin from the fresh solder also helps to clean the solder joint and makes de-soldering faster. There is no way anyone is going to deal with a volume like that using slower methods. The data sheet indicates that the formula for IC gain is: The best value for R3 would have been 200 Ohms. 5 years ago After he taught me how to solder and we completed the Velleman kit, he gave me a challenge to build an Audio Power Amplifier using only a schematic and a bunch of my salvaged parts. I've had great luck removing most Resistor types, Disk Capacitors, Mylar Capacitors, Electrolytic Capacitors, Transistors, Diodes, LED's, most push-button and sliding Switch types, and some IC's. I eventually progressed though. Solder the (-) side of capacitor C1 to the common ground wire. You can find audio and video samples of many of our products on our site, or you can check out our YouTube channel to see what else we've cooked up! He had his pool of molten solder on that sheet metal, and under it some kind of a gas burner, to keep the solder hot. I am very new to electronics. I got lucky and found three 1970's and 1980's vintage CB radios that weren't working. The datasheet recommended connecting a .1uF capacitor C5 across the output of the amplifier to prevent RF from being coupled into or out of the amplifier. I'm still learning how to do things with electronics but like it a lot. Thanks. These radios have tons of useful parts like transistors, resistors, crystals, IC's, and ceramic capacitors. Reply And, the data sheet had some example circuits I could use to start with. If the schematic is drawn well, it can be used to do the parts layout which makes it easier to troubleshoot or modify the circuit. 3. These piles were so tall he did not have to bend down to pick a board up. It was a lot of fun to work on it. Very exciting, even if it was only mono audio. I hope we see more from you in the future! If I wanted to salvage one IC off a double sided board you'd better believe I'd fire up my solder pot to do it too. My uncle taught me that every circuit should start with a schematic and then a component layout. I had a lot of 470uF capacitors so I used that for C1. Install the 1/8" phone jack on the breadboard and solder the phone jack ground (ring) pin to the common ground wire using a short piece of hookup wire. C6 blocks the DC output of the IC and passes the amplified audio to the speaker. 60/40 Rosin Core Solder (Radio Shack Catalog #6400009). Solder a wire from U1 Pin 1 and solder it to the +12V battery wire from underneath the breadboard so it stays in place. Did you make this project? My uncle took me to Radio Shack and bought me some soldering tools, parts, a digital multi-meter, and a Velleman LED blinker kit to practice soldering with. 5. So I turned down the variable resistor and then increased the volume on my phone. Insert capacitor C3 into the breadboard and solder the (+) end to resistor R3. The power output of the amplifier was strong enough to overload the small speaker I had attached to it. After some time I came to the conclusion that it was not worth it to me. 5 years ago 5. And I was very happy that it worked the first time. A lot of modern electronic devices aren't good candidates for part recycling due to the size of the components. So far the parts I have unsoldered seem to be working good. Insert capacitor C2 as shown on the layout diagram and solder the (-) side of the capacitor to the center pin of variable resistor R1. 11. This is the common ground wire for all components connected to ground. Most times the pins end up pulling out from the bottom of the transformer rendering it mostly useless. Insert capacitor C5 into the breadboard and solder one end to the (-) side of capacitor C4, and the other end to the common ground wire using a short piece of hookup wire. After I have removes the parts I want, I read the values and part numbers and keep a log of the inventory I have. Capacitor C4 is recommended by the datasheet to help the amplifier output to swing between the power supply rails which improves the efficiency of the amplifier IC. My phone doesn't have a very good camera :) My next project will be better. Keep at it, you only get better, not worse. Un-solder component leads with the solder pump. That would probably stink up the whole house, and I like doing electronics inside at the table. The perfect gift for the musician in your life! Run a bare piece of wire around the edges of the breadboard and solder the battery GND wire to it as shown in the layout diagram. Desoldering Pump (Radio Shack Catalog #6400210), 3. After that I was ready to start building. Mount the amplifier IC U1 on the breadboard. If the circuit is more complicated, I will tack solder a minimum number of parts to the IC leads to see if it smokes, and to test if it appears to work as expected. These kinds of projects help me get better without having to spend a lot of money. Audio Amplifier With Salvaged Parts: I enjoy salvaging electronic parts from discarded equipment. If I'd known about the alternative sooner, it is likely I'd have advanced sooner too. But as it is right now the amplifier works and sounds great. Gift Certificate. 6. We felt that a gain of 100 would be best but the data sheet did not recommend reducing the gain with external parts to 40db or below. That's cool that your uncle challenged you to do it. The project box is a Radio Shack Project Box Catalog #2701807. Well it is something to consider for the future for you then I suppose. A lot of modern electron… That part had some possibilities for a fun project. Solder the (+) side of capacitor C1 to the +12V battery wire. lol i been taking apart my useless electronic devices and trying to salvage and make something out of the components too, but i havent the knowledge or the patience to do the math equations to actually do a project but after reading this instructable spark up my curiosity to put my brain to work....i will be going through my "junk" (what my fiance calls it LOL) to see if i can find same components as in this and try to make it to! Next I took the amplifier setup outside in the garage and connected it to a 12V battery. But the rest have a good chance of being usable even after 40 years. 2. on Introduction. 2. Retro Analog Audio VU Meter From Scratch! on Introduction. Been there, done that, moved on. I'm getting better at soldering and component layout. Amplified Parts channel . The molten pool technique does seem pretty extreme, but it is the best way to go if you are serious about salvaging electronic components. Vite ! Melt the marked solder joints with a soldering iron and add fresh solder to the pad. If I can find another TA7222AP IC in my pile of salvaged CB radios, I'll wire up a second one on the breadboard and have a neat home-made stereo amplifier. What he had was sort of like a barbeque pit he'd made using concrete building blocks (what a lot of folks call cinder blocks). It works enough that it is hard to talk sense into anyone about better methods. I connected the amplifier to a 9V battery at first to avoid burning anything up too bad if I made a wiring mistake. This was a fun home-brew project. My process for removing the parts I want is: 1. Very informative and simple explanation that i can understand! Years later I saw a video on Youtube of a fellow in China with his homemade solder pot. Solder a short piece of hookup wire from U1 Pin 9 to the (-) side of capacitor C4. 4. 21. 3. Vacuum Tube Amplifier Sets. When salvaging old equipment, it is possible that there might be bad parts pulled from the PCB. 18. Then I move on to build something else. Solder the other end of R2 to the (+) side of capacitor C2. 16. I'm still working on my wiring skills but it was very easy to build the amplifier. 20. WOW! After a few minutes the IC was becoming fairly warm so I switched off the amplifier and called the test a success! Trying to do that with an iron is idiotic. Capacitor C1 is used to keep the amplifier from oscillating due to the resistance of the power supply leads, and to help remove noise from the power supply. Thanks. Electronics is lots of fun. 19. While salvaging parts from an old CD radio, I found a neat 10-pin SIP IC that was easily un-soldered from the circuit board. The best rarely comes easily. I'm pretty sure my parents wouldn't let me set up a circuit board barbeque to salvage electronic parts with. Mostly my circuits are simple and if I can't complete a project because of a bad part, I just count it as good soldering experience and not much time lost. Solder the right pin of variable resistor R1 to the common ground wire using a short piece of hookup wire. On that he had a piece of sheet metal he'd dished out concave. 9. This looks like an awesome project. A lot of people will gladly donate unwanted radios, stereos, CD radios, and other devices to someone like me that wants to learn and is willing to come get them. I would much rather stick with how my uncle taught me to do it. Normally the output of the IC is set at 1/2 of the power supply voltage which can't be directly connected to the speaker without burning it and/or the IC out. A lot of people will gladly donate unwanted radios, stereos, CD radios, and other devices to someone like me that wants to learn and is willing to come get them. Insert the variable resistor R1 as shown on the layout diagram and solder the left lead to the tip pin of the phone jack. 13. Before I call the project completed, I need to add a heat-sink to the amplifier IC and some vent holes in my project box.

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