Note- You must use shielded wires between the radio and the headphone jack. I usually use about a 2 to 3 foot wire lead between the radio and the headphone jack so the jack can be mounted in the dah somewhere. So if you connect the wire labelled "B" on the headphone jack schematic to the location labelled "B" on the radio schematic and do the same with location "A" on both schematics. Basically pick a location close to the volume control and test- if it doesnt sound good, move a little further back in the circuit and try again.īelow is a picture of a headphone jack with the resistors and wiring connected to it (sorry its a little blurry) The Forth is a difficult tube radio where you would need to do some experimenting. Look at the schematic to see where locations "3" and "7" are in relation to the volume control. The third is a tube radio with a fairly simple connection location- You may need to test a connection on both sides of the capacitor- Try a connection at location "3" and at location "7" and use whichever provides better sound. You will break the circuit between this switch and the volume control. The second is a transistorized AM/FM radio- AM/FM radios use a switch to connect the proper tuner section to the volume control. The first schematic is a transistorized AM only radio- Pretty straight forward you can see I marked the area where the circuit should be broken and labelled each side. This is why you set up the test AUX source in the earlier step.īelow is a few examples of some radio schematics. On transistorized radios, this should be easy- on tube radios it will be a little harder. This is where you will break the connection. Once you have found the volume control you only need to figure out which lead it the input to the volume control. Now it is time to look at your schematics- Now you may look at it and think "What is all this stuff- Im so lost" thats okay. connect a lead to the section closest to the connector body- This is the ground lead (Black wire in picture) connect another wire to the last section further from the connector body (green wire in the picture) Set this all aside and you will be using it later to verify you have found the correct connection point for your AUX input. We will be using the ground and left connection for testing. These are the ground, left and right channel. On the other end of the cable (not plugged into your MP3 player) you will see three sections. BE CAREFUL! I cant be held responsible if you blow out your iPod.Ĭonnect your test AUX source to a headphone style extenion plug (radio shack number 42-2387A (see picture) WARNING- testing by connecting an AUX source to your radio in the WRONG place could blow out your AUX source. I recommend an older portable FM radio, tape deck- Something you wouldnt miss if you accidentally broke it. This is all great in theory, but how do you adpat this to your radio? Lets find out:įirst thing you need is a test AUX source. If everythign was done right, you will hear your MP3 player (Or other source) through your stock radio. Includes radio mounting stand.After breaking the wire, you would connect the MP3 player to the volume control. New transistor module allows you to switch between the modern integrated circuit (IC) technology and the original transistor technology. A separate parts list will be shown for the FM radio after you have completed the AM radio. DO NOT OPEN the bags listed for the FM radio. At this time, only identify the parts that you will need for the AM radio as listed below. The project is divided into two parts, the AM Radio Section and the FM Radio Section. The Elenco AM/FM Radio Kit (Combo IC & Transistor) is a “superheterodyne” receiver of the standard AM (amplitude modulation) and FM (frequency modulation) broadcast frequencies. Allows you to switch between the modern integrated circuit (IC) technology.Includes a project of 9 lessons related to AM and FM broadcast frequencies.Elenco Radio Kit (Combo IC & Transistor).Miscellaneous Microcontroller Accessories.Gears, Belts, Pulleys, Tracks, Sprockets & Chains.
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