Ohm's Law, Diodes, Relays, Resistors

Knowledge of diodes, Ohm's law, relays, and resistors is essential to being a proficient alarm and car audio installer. For example, with just relays and a few diodes, you can build a circuit to work with your existing alarm or keyless entry to start your vehicle. Add a capacitor and a resistor to a relay and a diode and you've created a timer to use with it. Or, by adding a relay to your head unit's remote turn on wire, you can turn on several amplifiers, processors, lights, etc. With Ohm's Law, you can calculate current, power, voltage, and resistance such as the nominal impedance load of multiple speakers to an amplifier, and much more. Once you master these, you'll think of all kinds of things to create and add to your systems as well as your customers'. Ohm's Law Diodes Relays Resistors Mobile Electronics Basics: • Diodes • Glossary of Terms and Definitions • Ohm's Law • Relays • Resistors • the12volt's Install Bay - Mobile Electronics Forums • Tools and Equipment

Car Audio, Mobile Video, and Fiberglass

Car Audio: • Glossary of Terms and Definitions • Ohm's Law • Passive Crossovers & Calculators • Metra Application Guides • Power and Ground Cable Sizes • Subwoofer Enclosures & Calculators • Subwoofer Wiring • the12volt's Application Guide • the12volt's Install Bay (forums) • Thiele - Small Parameters • Tools & Equipment Passive Crossovers: • Low Pass Filters • High Pass Filters • Band Pass Filters • Narrow Band Pass Filters • Acoustical Output & Power • First Order Filters • Second Order Filters • Third Order Filters • Zobel • 2 Ohm Charts • 4 Ohm Charts • 8 Ohm Charts • Formulas & Calculators

Subwoofer Enclosures: • Calculators: Parallel, Series, Port Length, & Volume • Second Order / Infinite Baffle / Free Air • Second Order / Acoustic Suspension / Sealed • Fourth Order / Bass Reflex & Bandpass Enclosures • Sixth & Eighth Order / Bandpass Enclosures • Subwoofer Wiring Configurations • Thiele - Small Parameters • Fiberglass DVDs Featured Forum Topics: • Advanced front speaker systems how-to • Breaking in subs • Comprehensive front stage setup • Headrest Monitor How-To • Ground Q/A Sticky • Headrest Monitor How-To • How to choose a car CD receiver. • How to choose an amplifier. • How to identify stereo wiring. • How to upgrade the Big Three • How to wire through a door molex. • Guide: Using WinISD • Loudspeaker sensitivity vs efficiency • Too little power • What is a proper sub box? • Voice Coil Wiring and Transient Response

Car Audio Forum: • favorite car audio brand, updated • how to achieve awesome mid bass • How to upgrade the Big Three • running one 4 ohm vc on a dvc sub • fuse size? • debate, stiffening capacitors • ohms, using resistors with woofers? • How to choose an amplifier. • Ground Q/A sticky • Clipping • Advanced front speaker systems how-to • How to wire through a door molex. • Comprehensive front stage setup • What is a proper sub box? • How to identify stereo wiring. • Guide: Using WinISD • How to choose a car CD receiver. • Too Little Power • What is a proper ground? Mobile Video Forum: • Headrest how-to, 06 Chrysler 300c • Headrest Monitor How To, 91 Accord Fiberglass, Fabrication & Interiors: • Fiberglass DVDs • How to Make a Fiberglass Enclosure • flushing a remote, fun little project • Fiberglass, Mustang • Fiberglass shopping list • How to make circular rings • Sticky Packing peanut volume measurement

Car Security and Convenience

Car Security: • Basic Connections (inputs) • Basic Connections (outputs) • Car Alarm Modules • Car Alarm Sensors / Triggers • Door Locks • Light Flash / Illuminated Entry • Starter Interrupts • Accessories & Add-ons • the12volt's Application Guide • the12volt's Install Bay Lights, Neon, LEDs, HIDs Forum: • wig wags • Fog Light buzzer • LEDs in a row • LED tail light conversion • LED in my ashtray, resistor size? • flashing led

Door Locks: • Determining Switch Types • Multiple Wire Systems • Single Wire Systems • Special Systems • Add Auto Lock/Unlock Light Flash / Illuminated Entry: • Illuminated Entry w/Positive Door Triggers • Illuminated Entry w/Negative Door Triggers • Basic Light Flash • Two Wire Light Flash • Adding Light Flash with Siren Output Car Security & Convenience Forum: • key immobilizers and remote starting • tach wire general comments • what’s the reason to diode isolate? • how to test for wait to start wire. Starter Interrupts: • Normally Closed Starter Kill Relay • Normally Open Starter Kill Relay • Passive Starter Kill Diagrams (3)

Fluke 177 Digital Multimeter, 1000V, Backlight, Min/Max/Avg • 6000 count display delivers improved resolution • True-RMS AC voltage and current measurement • Min/Max/Average recording feature • Frequency, capacitance and resistance capabilities • Lifetime Warranty

How Electronic Things Work. . .And What to Do When They Don't by Robert Goodman Practical Electronics for Inventors by Paul Scherz Designing, Building, and Testing Your Own Speaker System with Projects by David B. Weems

High-Power Audio Amplifier Construction Manual by G. Randy Slone, Randy Slone Great Sound Stereo Speaker Manual by David B. Weems, G. R. Koonce Master Handbook of Acoustics by F. Alton Everest