A Presentation of Random Material in a Nonsensical Order
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Transcript of A Presentation of Random Material in a Nonsensical Order
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Benjamin W. Kidd - ENGR-162/12
A Presentation of Random Material in a Nonsensical Order
By Benjamin Kidd
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Benjamin W. Kidd - ENGR-162/12
The DPDT Reversing Circuit
How do we switch polarity using a DPDT switch?
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Benjamin W. Kidd - ENGR-162/12
The Knife Switch: A Simple DPDT
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Benjamin W. Kidd - ENGR-162/12
DPDT Reversing Circuit
The Double Pole, Double Throw (DPDT) switch allows us to choose which direction a DC current flows into the load.
To LoadFrom DCPowerSource
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Benjamin W. Kidd - ENGR-162/12
DPDT Reversing Circuit
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Benjamin W. Kidd - ENGR-162/12
DPDT Reversing Circuit
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Benjamin W. Kidd - ENGR-162/12
Diodes
Diode – A semiconductor device which acts as an electrical “one-way valve”. Diodes only pass current in one direction, namely from their cathode to their anode.
1N4002 Rectifier Diode
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Benjamin W. Kidd - ENGR-162/12
Diode Ratings
What to look for: Type – Rectifier*, Small Signal, Zener PIV – Peak Inverse Voltage – The maximum
voltage at which the diode can be used (Remember, Peak NOT RMS for AC Circuits).
Maximum Average Forward Rectified Current – The continuous value amount of current that the diode can withstand.
Peak Forward Surge Current – The short term amount of current the diode can withstand.
*The Rectifier diode will probably be the most useful in this class
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Benjamin W. Kidd - ENGR-162/12
Bridge Rectifier
Bridge Rectifier – A combination of four (4) rectifier diodes which rectify AC into DC. Bridge rectifiers can be made from four individual diodes or purchased as a package.
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Benjamin W. Kidd - ENGR-162/12
AC Rectification
Half Wave Rectification – Passes only positive (or negative) half of AC Sine Wave
Full Wave Rectification – Changes AC into “pulsating” DC
RMSACRMSDC
peakACpeakDC
VV
VV
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__
RMSACRMSDC
peakACpeakDC
VV
VV
_21
_
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Benjamin W. Kidd - ENGR-162/12
AC/DC Application
Simple 2-Step Lamp Dimmer (Warning – Only Works on loads that work on both AC and DC!)
When switch is closed, the diode is shorted and circuit operates at full 120VAC RMS. When switch is open, current is forced to flow through the diode, and the load only see’s half of the sinusoidal voltage.
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Benjamin W. Kidd - ENGR-162/12
DC Application
This circuit allows the control of two devices (loads) using only two wires with diodes located at the devices. Normally, this type of circuit would require three wires.
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
How to interconnect air systems reliably
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
How do I put an air connector on a hose?
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Benjamin W. Kidd - ENGR-162/12
Knowing your Connectors
I use the ¼” NPT connection for my demonstrations in class.
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
Start with a Hose “Barb” connector, hose clamp, and hose end.
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
Put the clamp around the hose. Then, push the barb into the hose. (Important Note: Hose barb will not come out of hose after being pushed in – like a fishhook.)
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
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Benjamin W. Kidd - ENGR-162/12
Tighten the hose clamp with a screw driver until screw is hard to turn.
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Benjamin W. Kidd - ENGR-162/12
Making the Connection
Finished connection
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Benjamin W. Kidd - ENGR-162/12
Connecting to Air
Prepare Connection with “Teflon” Tape. Wrap tape around threads leaving the first couple threads bare.
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Benjamin W. Kidd - ENGR-162/12
Connecting to Air
Screw Connections together. Wrench-tight connections are the most leak-proof, but do not overtighten.
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Benjamin W. Kidd - ENGR-162/12
Connecting to Air
Hmm…Gee Benjamin, this looks like this takes a lot of time.
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Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors
Quick Connectors allow rapid connection to air supplies, accessories, and hoses.
Female Connector Male Connectors
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Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors
Quick connectors attach to accessories and hoses using the normal “slow connect” connectors. Prepare the connection threads as before with Teflon tape.
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Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors
Wrench tighten to threaded connectors.
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Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors
Walla!
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Benjamin W. Kidd - ENGR-162/12
Solenoid Controlled Pneumatics (Or Hydraulics)
Using the “SV-2” Solenoid-valve to control air flow.
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Benjamin W. Kidd - ENGR-162/12
Solenoid Controlled Air
¾” “Garden Hose” ThreadTo 3/8” Barb All Electronics SV-2 Solenoid
Controlled Valve
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Benjamin W. Kidd - ENGR-162/12
Solenoid Controlled Air
Connect ¾” to 3/8” Hose Barb connector to air hose. Screw connector to input port of solenoid valve. (Suggestion: Prepare input port threads of valve with Teflon tape.)
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Or…How to not have spaghetti in front of the stage.
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Control Position Grid Outlet
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Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
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Benjamin W. Kidd - ENGR-162/12
Using Relays
Why did you bother mentioning these things, anyway?
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Benjamin W. Kidd - ENGR-162/12
Simple Relay Circuit for 120VAC
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Benjamin W. Kidd - ENGR-162/12
Simple Relay Circuit for 12VDC