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1 oscillator drives multiple solid state relays - 03/16/06 EDN-Design Ideas: A
conventional electromechanical relay often makes sense for switching large amounts of
load current on and off and when proportional control of the load’s current or voltage
is unnecessary. (circuit.....(design idea added 9/06) |
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122 VAC Lamp Chaser using Solid State Relays - This circuit is basically the same
as the 10 channel LED sequencer with the addition of solid state relays to control the
AC lamps. The relay shown in the diagram is a Radio Shack 3 amp unit (part no.
275-310) that requires 1.2 volts DC to activate. No current spec was given but I
assume it needs just a few....(circuit / schematic design added 6/06) |
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123 Volt AC Lamp Chaser using Solid State Relays - This circuit is similar to
LED clock using12 neon indicator lamps instead of LEDs. It operates from2 high
capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage
(70 volts) for neon lamps is obtained from a small ...(added 4/02) |
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2 Lead Solid State Breaker Resets Itself - 03/30/95 EDN-Design Ideas: Simple dc
circuit breaker can protect a power supply from ever-present screwdriver or even
isolate a satellites dual power system from a short circuit in one
subsystem.....(design idea added 03/03/03) |
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A DC-Coupled, Selectable-Gain Headphone Amplifier - This design uses two opamp
gain stages per channel for superior input buffering and a discrete bipolar output
stage with thermal tracking current mirrors. The amplifier's overall gain can be
adjusted to match the efficiency and impedance characteristic of any headphone. The
author provides detailed instructions for optimizing the ....Designed by Chester
Simpson (circuit design added 04/05/06) |
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A DIY Headphone Amplifier With Natural Crossfeed - Some crossfeed acoustic
simulators suffer from frequency-response anomalies (called Comb-filter effects)
because they use a fixed, frequency-independent delay in the crossfeed signal. The
author has developed a crossfeed filter/headphone amplifier with frequency-dependent
delay that eliminates the Comb-filter effect. It is ....Designed by Jan Meier
(circuit design added 04/05/06) |
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A Pocket Headphone Amplifier - This is a Chu Moy headphone amp I made. I got the
PCB design from Guzzler from Head-Fi and the original design is very popular and is
here. I changed Guzzler's layout so I could use a Taiwan Alpha pot on the PCB. These
pots a high quality (some say better than ALPS blue velvet) and are available from
Jaycar. You can see the thread here. I also made a DIY Brown dog adapter so I could
use two OPA627 single opamps in a dual opamp socket. |
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A Portable DAC with Headphone Amplifier - This portable DAC can improve the sound
from portable devices, such as PCDPs, and other digital gear that has a TOSLINK
optical or coax digital output. It features the Burr-Brown DIR1703 receiver and the
Analog AD1866 DAC ICs for digital conversion and a high-quality multi-loop headphone
amplifier that can drive low-impedance loads with authority....Designed by Andrija
Ifkovic (circuit design added 04/05/06) |
|
A Precision Preamplifier-Power Amplifier System with Natural Crossfeed Processing
- This article presents a preamplifier design with natural crossfeed processing for
headphone listening and a novel ALL-OPAMP power amplifier design. The preamplifier is
a major revision of the original DIY Headphone Amplifier With Natural Crossfeed. Both
the preamp and power amp are fully regulated and feature opamps that are biased to
operate in semi-class A mode.... Designed by Jan Meier (circuit design added
04/05/06) |
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A Simple Tube/Opamp Hybrid Amplifier - This amplifier uses one tube and has low
voltages throughout, thereby reducing the shock hazard present in high voltage tube
chasses. A grounded cathode front-end is loaded with a constant current source and
drives a unity-gain opamp backend. The authors give instructions for accommodating
both FET-input and BJT-input opamps. Designed by Alex Cavalli, Mark Lovell and
Bill Pasculle (circuit design added 04/05/06) |
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AC Switching with TRIAC From TTL - The MC3032 is an optoisolator TRIAC driver. The
180-ohm resistor sets the current for the LED emitter in the optoisolator. Change the
value of this resistor, if necessary, to get reasonable current ASCII format
(e.g., 15 mA). Note that you cannot test this circuit without a load. The TRIAC
will not switch unless connected to an AC voltage source, so you can't test it for
simple switching w/o applying AC and a load. Note the 500V ating on the .01 cap.
(ASCII format circuit added 4/02) |
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AN-252: Using the AD2S80 Series Resolver to Digital Converters with Synchro's; Solid
State Scott-T Circuit. - AN-252 Analog Devices Application Notes (app note
added 6/06) |
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AN762: AN762 Applications of the TC62X Solid-state Temperature Sensors - Microchip
Application Note Published 23-Jun-04 (app note added 6/06) |
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Application Circuits of the TC620/TC621 Solid-State Temperature Sensors -
Microchip Application Note Published 16-Aug-04 (app note added 6/06) |
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Applications of the TC62X Solid-state Temperature Sensors - Microchip Application
Note Published 23-Jun-04 (app note added 6/06) |
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Basic Solid State Relays - (electronic circuit added 05/06/07) |
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Blue Hawaii Hybrid Electrostatic Amplifier for Stax Omega II Headphones -
Fully-balanced, discrete transistor front end and tube output stage using EL34s in
grounded grid configuration. This amp is the author's answer to the legendary Stax T2
amplifier. Designed by Kevin Gilmore (circuit design added 04/05/06) |
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Buffered Headphone Driver/Preamplifier - With a fast Motorola buffer as its only
active circuitry, this design specifies the highest quality parts and careful
construction to avoid signal coloration. The author includes instructions for
substituting other buffer ICs. Designed by Eldon Pawliw (circuit design
added 04/05/06) |
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Build This High Quality Headphone Amplifier - Especially good for listening to
digital recordings, this headphone amplifier features an opamp front-end with
complementary bipolar outputs for excellent linearity and high-drive capability. It
exhibits low noise, can drive headphones of any impedance and protects against shorts.
Designed by Earle Eaton (circuit design added 04/05/06) |
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Charge Coupled Bi-Directional Power Mosfet Relay - The circuit uses an inexpensive
C-MOS inverter package and a few small capacitors to drive two power MOS transistors
from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs
are small, the leakage current from the power line into the control circuit is a tiny
4uA. Only about 1.5mA of DC is needed to turn on and off 400 watts of AC or DC power
to a load. Published in Electronic Design, Nov. 8, 1990. ….(designed by David A.
Johnson) |
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Circuits protect outputs against overvoltage - 10/11/07 EDN-Design Ideas: Adding a
solid-state relay and control circuitry to an amplifier's output provides overvoltage
protection.....(design idea added 10/07) |
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Designing an OpAmp Headphone Amplifier (Solid State & Tubes) - Design principles
and circuits for building opamp-based headphone amplifiers. This article reviews
selection criteria, feedback configurations, capacitor coupling, RF shielding, output
stage topology, short circuit protection, equalization, acoustic simulation, headphone
distribution amplifiers and power supply options....Designed by HeadWize
(circuit design added 04/05/06) |
|
DIY Headphone Amplifier With Natural Crossfeed - Some crossfeed acoustic
simulators suffer from frequency-response anomalies (called Comb-filter effects)
because they use a fixed, frequency-independent delay in the crossfeed signal. The
author has developed a crossfeed filter/headphone amplifier with frequency-dependent
delay that eliminates the Comb-filter effect. It is constructed.... Designed by Jan
Meier (circuit design added 04/05/06) |
|
Electromagnetic Emissions Test Report on Solid State Energy Meter - Electro Analog
Devices Application Notes (app note added 6/06) This report describes
electromagnetic immunity testing performed on September 9, 1999 through September 10,
1999 on the Solid State Energy Meter. Testing was performed pursuant to IEC 1036:1996,
a standard for alternating static watt-hour meters for active energy. |
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Electronic Circuit Breaker - This circuit uses the on-resistance of the MOSFET as
the current sensor. Reset it by removing the input power or the load. The circuit
draws no current unless tripped. Designed by Andrew R. Morris (added
09/05) |
|
One oscillator drives multiple solid state relays - 03/16/06 EDN-Design Ideas: A
conventional electromechanical relay often makes sense for switching large amounts of
load current on and off and when proportional control of the load’s current or voltage
is unnecessary. (circuit.....(design idea added 9/06) |
|
Pocket Headphone Amplifier - This is a Chu Moy headphone amp I made. I got the PCB
design from Guzzler from Head-Fi and the original design is very popular and is here.
I changed Guzzler's layout so I could use a Taiwan Alpha pot on the PCB. These pots a
high quality (some say better than ALPS blue velvet) and are available from Jaycar.
You can see the thread here. I also made a DIY Brown dog adapter so I could use two
OPA627 single opamps in a dual opamp socket. |
|
Portable DAC with Headphone Amplifier - This portable DAC can improve the sound
from portable devices, such as PCDPs, and other digital gear that has a TOSLINK
optical or coax digital output. It features the Burr-Brown DIR1703 receiver and the
Analog AD1866 DAC ICs for digital conversion and a high-quality multi-loop headphone
amplifier that can drive low-impedance...Designed by Andrija Ifkovic (circuit
design added 01/08) |
|
Precision Preamplifier-Power Amplifier System with Natural Crossfeed Processing -
This article presents a preamplifier design with natural crossfeed processing for
headphone listening and a novel ALL-OPAMP power amplifier design. The preamplifier is
a major revision of the original DIY Headphone Amplifier With Natural Crossfeed. Both
the preamp and power amp are fully regulated and feature....Designed by Jan Meier
(circuit design added 03/08) |
|
SCR phase control yields solid state switch - 03/15/01 EDN-Design Ideas: SCRs
(silicon-controlled rectifiers)/ PDF contains multiple circuits scroll to find the one
of interest, or thyristors, have higher current and voltage ratings, lower conduction
losses, and more robustness than triacs. For these reasons, SCRs are better suited to
high-power applications.....(design idea added 11/05) |
|
SCR Tester - This simple SCR tester can be made with only a couple components. It
will provide a visual 'go' or 'no-go' indication--it is simply a voltage source, a
lamp, and a resistor through which gate current is supplied. (Tony van Roon's
electronic design added 2/06) |
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SDS Labs Headphone Amplifier - This headphone amplifier can output 4W, enough to
drive some loudspeakers. It has a FET opamp front-end with complementary MOSFET
outputs and a toroidal transformer-based regulated power supply. This version "biases"
the opamp into class A operation by tying its output to one of the MOSFET ....Designed
by Sheldon D. Stokes (circuit design added 03/08) |
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Semiconductor Relays - general info and many example circuits (added 5/02) |
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Simple Electronic Circuit Breaker - This circuit uses the on-resistance of the
MOSFET as the current sensor. Reset it by removing the input power or the load. The
circuit draws no current unless tripped. Designed by Andrew R. Morris
(added 09/05) |
|
Simple Tube/Opamp Hybrid Amplifier - This is an even simpler transistor based
motorcycle alarm. The circuit features a timed output and automatic reset. It can be
operated manually using a key-switch or a hidden switch. By adding an external relay,
it will set itself automatically, and/or immobilize the machine, every time you
turn-off the ignition.....(circuit design added 08/08/08) |
|
Solid state analog data recorder runs for 7.4 days - 11/22/07 EDN-Design Ideas:
Using a nonvolatile SRAM, this analog data recorder can store more than seven days'
worth of data.....(design idea added 9/08) |
|
Solid State Relay - (Tony van Roon's circuit added 9/04) |
|
Solid State Relay Requires only 50uA Drive Current - This circuit demands a
control current that is 100 times smaller than that needed by a typical optically
isolated solid state relays. It is ideal for battery powered systems. Using a
combination of a high current triac and a very sensitive low current SCR, the circuit
can control about 600 watts of power to load while providing full isolation and
transient protection. Published in Electronic Design, Dec 2, 1996. ….(designed by
David A. Johnson) |
|
Solid State Relay Requires Ultra Low Control Current - Most solid state relays
require at least 5ma and often more input control current, to fully turn on the
device. But such current levels often force battery powered circuits to use
excessively large batteries. The relay hobby circuit shown below demands only
50uA of input current. This about 100 times lower than that needed by a typical
optically isolated solid state relays. The circuit uses a combination of a high
current triac and a very sensitive low current SCR, to control up to 600 watts of
power to a load, while providing full isolation and transient protection. ….(designed
by David A. Johnson) |
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Solid State Relay Saves Battery's Life - 09/01/94 EDN-Design Ideas: The circuit in
Fig 1 uses a low-resistance p-channel FET, Q4, to disconnect a load from the battery
when the battery's voltage drops below a certain value. After you disconnect the
circuit, it remains off until you remove and replace the battery.....(design idea
added 2/05) |
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Solid state relays simplify monitoring electric car Battery Voltage - 02/19/04 EDN-Design
Ideas: Figure 1 shows the propulsion system of an electric vehicle. It includes an
electric motor, drive electronics, a mechanical transmission, vehicle control/power
management, a charging system, and a battery. The long-term performance of the
electric vehicle depends on ensuring the electrical health of the battery and its
charging system.....(design idea added 1/05) |
|
Solid State Switch for DC Operated Gadgets - (electronic Circuit / Schematic added
10/04) |
|
Solid state Tesla Coil with 555 Timer - This is the more reliable version of the
one above. Self resonant circuitry is changed with a pulse generator. Yet very simple
in construction. Contents: Schematics, diagrams, PCBs, photos, videos, and links to
related experiments. ( Simple plasma globe and Simple Ion motor )….(circuit design
added 08/08) |
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Solidstate Remote Control Switch - Circuit design (added 02/05) |
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Solid-State Tesla Coil, #1 - (Tony van Roon's circuit / schematic added 2/06) |
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Solid-State Tesla Coil, #2 - (Tony van Roon's circuit / schematic added 2/06) |
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Square Tesla Coil - (Tony van Roon's circuit / schematic added 2/06) |
|
Switch Intelligently Controls Current - 03/30/00 EDN-Design Ideas: This circuit
can intelligently control ac or dc current when connected in series with a
load.....(design idea added 5/02) |
|
The Kumisa II Headphone Amplifier - A DC-coupled headphone amplifier based on the
Analog Devices AD844 opamp. This design employs a temperature-sensitive biasing system
on the bipolar output stage to prevent thermal runaway. Both the opamp and the output
stage are biased to run predominantly in class A. Designed by Benny P. Jørgensen
(circuit design added 01/08) |
|
The Kumisa III Headphone Amplifier - A discrete all-bipolar, zero feedback class A
amplifier with a new opamp-based servo. The servo operates outside the audio feedback
loop by controlling a pair of current mirrors at the input stage. Designed by
Benny Jørgensen (circuit design added 01/08) |
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The Lindesberg Portable Headphone Amplifier With Crossfeed - This
state-of-the-art portable headphone amplifier is based on the AD823 and AD812 opamps
and employs several techniques to minimize opamp input errors such as balancing input
impedances and composite amp output stages. It also features separate power supplies
for the voltage gain and output stages. The crossfeed network is from a design by
Ingvar Ohman. Designed by Toni Kemhagen (circuit design added 03/08) |
|
Transformer Driver Controls BiDirectional Switch - 07/17/97 EDN-Design Ideas:
-You can use a transformer-driver IC to simply control a MOSFET on/off
switch.....(design idea added 3/03) |
|
Two Lead Solid State Breaker Resets itself - 03/30/95 EDN-Design Ideas: Simple dc
circuit breaker can protect a power supply from the ever-present screwdriver or even
isolate a satellites dual power system from a short circuit in one
subsystem.....(design idea added 03/03/03) |
|
Using the AD2S80 Series Resolver to Digital Converters with Synchro's; Solid State
Scott-T Circuit. - AN-252 Analog Devices Application Notes (app note added
6/06) |
