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40kHz Ultrasound Receiver - A X100 transistor amplifier is followed by a zero
cross detector circuit, using a voltage comparator. The output is a TTL logic signal,
corresponding to the received 40KHz signal. (added 7/06) ….(designed by David A.
Johnson) |
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An Introduction to TVS Devices - MicroNote 102 from Microsem Describes and
illustrates performance of basic types of transient voltage suppresors (TVSs)
including gas discharge tubes, metal oxide varistors (MOVs), silicon pn junction TVSs
and thyristors. (Application Note added 6/06) |
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An Introduction to Zener Diodes - MicroNote 201 from Microsem (app note
added 6/06) |
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AN-1 Understanding the Single-Ended SCSI Bus - Application Note Microsemi 1201
(added 06/07) |
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Cross Referencing TVS Devices - MicroNote 107) from Microsem Accentuates the
electrical parameters to be compared when replacing an axial leadded device with an
equivalent surface mount component. Illustrations are given in making selections.
(Application Note added 6/06) |
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Crowbars and Clamps - MicroNote 106 from Microsem (Application Note added
05/07) |
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Derating TVS at Elevated Temp for varying XXX - MicroNote 115 from Microsem This
note combines the information in MicroNOTES114 and 104 above to accomodate those
conditions in which temperature is above 25°C and pulse width varies significantly
from specified conditions. (Application Note added 6/06) |
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Derating TVS devices for Higher Junction Temp - MicroNote 114 from Microsem Most
silicon TVSs are derated linearly from max rating at 25°C down to zero at 175°C. This
note shows the reader how to use the derating curve for assigning the maximum surge
rating for a device at any point between 25°C and 175°C. (Application Note added 6/06) |
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Determining Clamping Voltages for Pulse Currents - MicroNote 108 from Microsem
(Application Note added 05/07) |
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Effective use of Space Saving TVSArrays - MicroNote 123 from Microsem
(Application Note added 6/06) |
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How to Select a Transient Voltage Suppressor - MicroNote 125 from Microsem
(Application Note added 6/06) |
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Lightning Protection for Aircraft Electrical Systems - MicroNote 127 from Microsem
(Application Note added 05/07) |
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Lightning Protection for Aircraft per RTCA/DO-160D for ARINC 429 Protocol -
MicroNote 126 from Microsem (Application Note added 05/07) |
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Overall TVS Selection - MicroNote 130 from Microsem (Application Note added
6/06) |
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Parallel Stacking TVS devices for Higher Current - MicroNote 113 from Microsem For
lower voltage applications, higher voltage surge capability can be achieved by
parallel stacking. Devices must be matched very closely for load sharing, within 50mV
for an 8V requirement and within 200mV for 30V. Examples are shown. (Application Note
added 6/06) |
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Parasitic Capacitance in TVS - MicroNote 110 from Microsem Illustrates the
inherence capacitance values in a silicon TVS and how to minimize this effect with low
capacitance silicon diode elements where required. (Application Note added 6/06) |
|
Parasitic Lead Inductance in TVS - MicroNote 111 from Microsem Reduced protection
offered by a TVS results when longer than tolerable component lead lengths product
overshoot voltages resulting from L(di/dt) effects. (Application Note added 6/06) |
|
Protecting Data I/O ports with TVSArrays - MicroNote 121 from Microsem
(Application Note added 6/06) |
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Protection at a Transformer - MicroNote 116 from Microsem Illustrates the chief
advantage, which is higher surge rating, of placing the TVS on the low voltage
secondary output. A case history is used in depicting this advantage.
(Application Note added 6/06) |
|
Selecting TVS with PPP and Waveform Considerations - MicroNote 120 from Microsem
(Application Note added 6/06) |
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Series Stacking TVS devices for Higher Current - MicroNote 112 from Microsem
Series stacking of TVSs can be employed to increase peak pulse power and surge current
since power is additive for parts in series. Practical applications are illustrated.
(Application Note added 6/06) |
|
Transient Protection across High Data Rate and RF Lines - MicroNote 122 from
Microsem (Application Note added 6/06) |
|
TVS/Chip Product Overview - MicroNote 118 from Microsem (Application Note
added 6/06) |
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Unidirectional/Bi-Directional TVS Differences - MicroNote 128 from Microsem
(Application Note added 6/06) |
|
Upscreening Commercial TVS Diodes for Avionics and Robust Environments or Applications
- MicroNote 129 from Microsem (Application Note added 6/06) |
|
What is a TVS? - MicroNote 103 from Microsem Illustrates why a silicon TVS is
needed, how it diverts transient current away from vulnerable circuitry and reviews
device pulse power ratings. (Application Note added 6/06) |
|
2 Stage Chaotic Colpitts Oscillator for the UHF range - Electronic Circuit design
(added 06/07) |
|
200MHz400MHz VOLTAGE controlled Oscillator - If you need a clean emitter coupled
logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses
four voltage-controlled capacitors to change the frequency. (designed by Dave
Johnson) |
|
CMOS Inverter VCO tunes octave to UHF - 11/19/98 EDN-Design Ideas:.....(design
idea added 3/03) |
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Rolling code 4-channel UHF remote Control - (electronic circuit added 4/05) |
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Two Stage Chaotic Colpitts Oscillator for the UHF range - Electronic Circuit
design (added 06/07) |
|
UHF TV PreAmplifier - This circuit is designed to work at UHF frequencies in the
range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV
signals….(schematic added 9/02) |
|
VHF/UHF Prescaler - The recommended Prescaler is ridiculously simple. It consists
of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or
by 256. This chip is widely available both new and in the surplus market at much lower
prices than conventional divide by 10 prescalers. (added 08/08/08) |
|
VHF/UHF TV Modulator - Simple oscillator that generates a frequency in the VHF or
UHF region. The oscillator is modulated with the video signal and the modulated
carrier wave thus generated is fed into the TV set's aerial input via a cable. Then
all that remains to do is tune the TV to the correct frequency. |
|
40kHz Ultrasound Receiver - A X100 transistor amplifier is followed by a zero
cross detector circuit, using a voltage comparator. The output is a TTL logic
signal, corresponding to the received 40KHz signal. (added 7/06) ….(designed by
David A. Johnson) |
|
AN597: Implementing Ultrasonic Ranging - Microchip Application Note Published
26-Aug-97 (app note added 6/06) |
|
Circuit for a Critter Ridder - Ultrasonic Sound Generator (circuit design added
10/06) |
|
Good Old Parking Sonar - This was one of my first designs: it is an ultrasonic
parking sonar. Based on an ultrasonic amplifier from an article seen on a 1982
magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It
served very well for many years. Connecting it to the reverse gear lights, it switches
on automatically and shows you the distance to the nearest obstacle (according to his
beam) on a led scale. When the last led lights, a buzzer is also activated telling you
to stop immediately....(added 06/05) |
|
Implementing Ultrasonic Ranging - Microchip Application Note Published 26-Aug-97
(app note added 2/06) |
|
IR Detector/Emitter - (electronic circuit added 4/05) |
|
Medium Power 40kHz Ultrasound Transducer Driver - This crystal controlled circuit
drives a 40KHz piezoelectric transducer with a 30v peak to peak signal. (added
7/06) ….(designed by David A. Johnson) |
|
PIC16F873 Ultrasonic Range Meter - (circuit / schematic design added 6/06) |
|
Popular Electronics Ultrasound Detector - (electronic circuit added 4/05) |
|
Receiver Circuit-Ultrasonic Switch - The circuit described generates (transmits)
ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control
system this cirucit comprises of a mini transmitter and a receiver circuit.
Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from
the transmitter and switches on a relay |
|
Ultrasonic Alarm - This alarm device transmits the ultrasonic and it confirms a
reflected wave from the obstacle. If there is object within the set distance, it
doesn't give the alarm. When there is no object within the set distance, it gives the
alarm. The distance which can be set is from about 40 cm to 5-6 m. For example, when
making a setting distance 5 m, it gives the alarm when the reflected wave from 40 cm
to 5 m passes away. ….(added 05/08) |
|
Ultrasonic Dog Whistle - (electronic Schematic added 02/05) |
|
Ultrasonic Parking Sonar - (electronic circuit added 09/05) |
|
Ultrasonic ParKontroller - Are you afraid that your brand new Hummer is going to
get scratched while parking it in a tight space? Do you have trouble backing
your large Mercedez S-class into your small garage? Fear no more! Our
ultrasonic ParKontroller can sense how far you are away from the wall....(added
08/08/08) |
|
Ultrasonic Pest Repellent - It is well know that pests like rats, mice etc are
repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can’t
hear these high-frequency sounds. Unfortunately, all pests do not react at the same
ultrasonic frequency. While some pests get repelled at 35 kHz, some others get
repelled at 38 to 40 kHz. Thus to increase the effectiveness, …. (added 10/05) |
|
Ultrasonic Pest Repeller - (electronic design / schematic added 2/05) |
|
Ultrasonic radar - This is a very interesting project with many practical
applications in security and alarm systems for homes, shops and cars. It consists of a
set of ultrasonic receiver and transmitter which operate at the same frequency. When
something moves in the area covered by....(electronic design added 09/06) |
|
Ultrasonic Range & Imager - This is the electronic schematic of the homebuilt
SONAR. Only one piezoelectric tranducer is used for both tramsmit & receive. This
transducer is switched from TX to RX via the four 4016 switches. A high gain amplifier
stage & rectifier translates the received echoes into voltage pulses. The timing is
controlled by the PIC12C508 8-pin microcontroller....(circuit added 06/07/08) |
|
Ultrasonic Range Finder Circuit - (electronic diagram added 6/03) |
|
Ultrasonic Range Finder uses Few Components - 06/24/99 EDN-Design Ideas: An
ultrasonic, or sonar, range finder is a common sensor in robotic systems and
industrial environments. Even home and automotive uses are possible. A novel sensor
design consists of a WC, a few peripheral components, and a pair of ultrasonic
transducers (Figure 1). The range-finder.....(design idea added 1/06) |
|
Ultrasonic Range Meter - This circuit is measuring the range to an object by using
ultrasonic transmitter and ultrasonic receiver. The distance is calculated by PIC
microprocessor and is displayed on the three digit 7-segment LED display.
….(electronic design added 10/06) |
|
Ultrasonic Remote Control and Alarm - (electronic schematic / circuit added 4/02) |
|
Ultrasonic Sound Detector - Its Useful to hear Ultrasonic Sounds....(circuit
design added 12/08) |
|
Ultrasonic Switch (Andrew Wilson) - The circuit described generates (transmits)
ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control
system this cirucit comprises of a mini transmitter and a receiver circuit.
Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from
the transmitter and switches on a relay....(electronic circuit added 4/05) |
|
Ultrasonic Transducer Oscillator Circuit - ASCII format (added 4/02) |
|
Ultrasound Detector - (electronic circuit added 7/03) |
|
UV light Box - I have been making PCBs for quite a number of years but one om my
material suppliers has recently changed the Photoresist spray ingredients and it can
no-longer be used with "high-spectrum visible light. This means I am now forced to
have a UV-light box. I therefore built mine and the moment it is a "lashup" fixed to
the workbench with masking tape. So please excuse me if I do not include a
photograph....(electronic circuit added 4/05) |
