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Step 2Wiring the Circuit
For your benefit (and mine for not having to explain everything) I've included a schematic/wiring diagram of the circuit. I will, however explain the flow of electricity to you can get a better understanding.
The electricity flows from an electrical outlet into the two leads of the transformer (polarity does not matter, just make sure you know which side of the transformer is the input and which is the output). Then, converted from 120VAC to 13.5VAC, it flows through a bridge rectifier circuit with the capacitor (see the second image, courtesy of Wikipedia). The bridge rectifier changes the AC voltage into a pulsating DC voltage with a + and - , and the capacitor (wired as shown, make sure you wire the + to + and the - to -!!!!!) filters the current to smooth out the pulses into a constant flow of electricity. From here, the negative lead goes to the first switch's middle prong. One of the other prongs is then connected to the middle prong of the other two switches, as well as to an LED with a resistor (resistance will vary depending on your transformer). This LED is then connected directly to the + lead of the capacitor, making a circuit.
Moving on to the second switch. Wire one of the outer prongs of the switch to the - lead of the Peltier unit and wire the + lead directly to the + lead of the capacitor. Wire this same prong to another LED and resistor (make sure you've got the correct polarity on the LED: the notched or flat side is usually negative). Then wire the + lead of the LED to, you guessed it, the + lead of the capacitor. The center prong of this switch should be connected to the first switch.
Finally, the last switch. The middle prong is connected to the other two switches. Connect the - lead of one fan to an outer prong and the - lead of the other fan to the remaining prong. Then connect both of the + fan leads to the + lead of the capacitor.
Make sure everything's insulated with tape or heat-shrink tubing as well.
You're done wiring!
The electricity flows from an electrical outlet into the two leads of the transformer (polarity does not matter, just make sure you know which side of the transformer is the input and which is the output). Then, converted from 120VAC to 13.5VAC, it flows through a bridge rectifier circuit with the capacitor (see the second image, courtesy of Wikipedia). The bridge rectifier changes the AC voltage into a pulsating DC voltage with a + and - , and the capacitor (wired as shown, make sure you wire the + to + and the - to -!!!!!) filters the current to smooth out the pulses into a constant flow of electricity. From here, the negative lead goes to the first switch's middle prong. One of the other prongs is then connected to the middle prong of the other two switches, as well as to an LED with a resistor (resistance will vary depending on your transformer). This LED is then connected directly to the + lead of the capacitor, making a circuit.
Moving on to the second switch. Wire one of the outer prongs of the switch to the - lead of the Peltier unit and wire the + lead directly to the + lead of the capacitor. Wire this same prong to another LED and resistor (make sure you've got the correct polarity on the LED: the notched or flat side is usually negative). Then wire the + lead of the LED to, you guessed it, the + lead of the capacitor. The center prong of this switch should be connected to the first switch.
Finally, the last switch. The middle prong is connected to the other two switches. Connect the - lead of one fan to an outer prong and the - lead of the other fan to the remaining prong. Then connect both of the + fan leads to the + lead of the capacitor.
Make sure everything's insulated with tape or heat-shrink tubing as well.
You're done wiring!
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Thanks to very much
SAludos
Juan Saab-Rafful