Transcript A Presentation of Random Material and a Nonsensical Order

A Presentation of Random
Material in a Nonsensical Order
By Benjamin Kidd
Benjamin W. Kidd - ENGR-162/12
The DPDT Reversing Circuit
How do we switch polarity using a
DPDT switch?
Benjamin W. Kidd - ENGR-162/12
The Knife Switch: A Simple DPDT
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.
From DC
Power
Source
To Load
Benjamin W. Kidd - ENGR-162/12
DPDT Reversing Circuit
Benjamin W. Kidd - ENGR-162/12
DPDT Reversing Circuit
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
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
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.
Benjamin W. Kidd - ENGR-162/12
AC Rectification

Half Wave Rectification – Passes only positive (or
negative) half of AC Sine Wave
VDC _ peak  VAC _ peak
VDC _ RMS  12 VAC _ RMS

Full Wave Rectification – Changes AC into
“pulsating” DC
VDC _ peak  VAC _ peak
VDC _ RMS  VAC _ RMS
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.

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.
Benjamin W. Kidd - ENGR-162/12
Making the Connection
How to interconnect air systems
reliably
Benjamin W. Kidd - ENGR-162/12
Making the Connection

How do I put an air connector on a
hose?
Benjamin W. Kidd - ENGR-162/12
Knowing your Connectors

I use the ¼” NPT connection for my
demonstrations in class.
Benjamin W. Kidd - ENGR-162/12
Making the Connection

Start with a Hose “Barb” connector, hose
clamp, and hose end.
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.)
Benjamin W. Kidd - ENGR-162/12
Making the Connection
Benjamin W. Kidd - ENGR-162/12

Tighten the hose clamp with a screw
driver until screw is hard to turn.
Benjamin W. Kidd - ENGR-162/12
Making the Connection

Finished connection
Benjamin W. Kidd - ENGR-162/12
Connecting to Air

Prepare Connection with “Teflon” Tape. Wrap
tape around threads leaving the first couple
threads bare.
Benjamin W. Kidd - ENGR-162/12
Connecting to Air

Screw Connections together. Wrenchtight connections are the most leakproof, but do not overtighten.
Benjamin W. Kidd - ENGR-162/12
Connecting to Air

Hmm…Gee Benjamin, this looks like this
takes a lot of time.
Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors

Quick Connectors allow rapid connection
to air supplies, accessories, and hoses.
Female Connector
Male Connectors
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.
Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors

Wrench tighten to threaded connectors.
Benjamin W. Kidd - ENGR-162/12
Using Quick Connectors

Walla!
Benjamin W. Kidd - ENGR-162/12
Solenoid Controlled
Pneumatics (Or Hydraulics)
Using the “SV-2” Solenoid-valve to
control air flow.
Benjamin W. Kidd - ENGR-162/12
Solenoid Controlled Air
¾” “Garden Hose” Thread
To 3/8” Barb
All Electronics SV-2 Solenoid
Controlled Valve
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.)
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Or…How to not have spaghetti in
front of the stage.
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Control Position
Grid Outlet
Benjamin W. Kidd - ENGR-162/12
Efficient Control Wiring
Benjamin W. Kidd - ENGR-162/12
Using Relays
Why did you bother mentioning
these things, anyway?
Benjamin W. Kidd - ENGR-162/12
Simple Relay Circuit for 120VAC
Benjamin W. Kidd - ENGR-162/12
Simple Relay Circuit for 12VDC
Benjamin W. Kidd - ENGR-162/12