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Last Updated on:
Wednesday, November 29, 2017 05:39 AM
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Circuits Designed by Dave Johnson, P.E. : |
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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Automatic Headlight Brightness Switch (Aaron Cake) - Driving the
highway with your high-beam headlights can really increase your visibility,
but can be a blinding hazard for other drivers. This simple circuit
can be wired into your headlight switch to provide automatic switching
between high and low beam headlights when there is oncoming traffic. It does
this by sensing the lights of that traffic. In this way, you can drive
safely with your high-beams on without blinding other drivers.... [Aaron
Cake's design] |
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Automatic Speed Controller for fans & Coolers - During summer
nights, temperature is initially quite high. As time passes,
temperature starts dropping. Also, after a person falls asleep,
metabolic rate of one’s body decreases. Thus, initially fan/cooler
needs to be run at full speed. As time passes, one has to get up again and
again to adjust speed of fan or .… (added 10/05)
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Automotive & Household Siren Driver Circuits: ZSD100 & Discrete 'H'-Bridge
Minimum Parts Count Solution - Zetec Semiconductors
Applications Notes A solution is provided that uses a minimum number of
components by utilising an application specific signal generation IC, and a
high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style
switching transistors. (app note added 2/06) |
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Automotive 12v Electrical System Voltage Indicator - This battery powered
unit is designed to quickly aid troubleshooting of 12v electrical systems in a car.
Three LEDs proved a visual indication of a +12v, ground or an open circuit voltage
level. …. [Hobby Corner Circuit by Dave Johnson] |
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Automotive 12V to +-20V converter (for audio amplifier) - The limitation of
car supply voltage (12V) forces to convert the voltages to higher in order to power
audio amplifiers. In fact the max audio power x speaker (with 4 ohm impedance) using
12V is (Vsupply+ - Vsupply-)^2/(8*impedance) 12^2/32 = 4.5Watts per channel, that is
laughable....For powering correctly an amplifier the best is to use a symmetric supply
with a high voltage differential. for example +20 - -20 = 40Volts in fact 40^2/32 = 50
Watts per channel that is respectable. This supply is intended for two channels
with 50W max each (of course it depends on the amplifier.... |
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Automotive Electrical Voltage Indicator - This circuit will indicate if an
automotive electrical circuit has zero volts or 12 volts present.... [Designed by
David A. Johnson] |
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Automotive Electronic Functional Test Using Agilent System Components -
Agilent Application Note (added 6/06) |
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Automotive link uses single wire - 3-Apr-03 Issue of EDN In the
automotive industry, in which the goal is to produce cars with simpler, lighter wiring
looms, any interface that uses just one wire instead of two offers a distinct
advantage. The circuit in Figure 1 implements a bidirectional link using a single
wire, with the car's chassis or ground conductor providing a negative return path....
[Design Idea by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK] |
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