MINIATURE ISOLATED AC/DC POWER SUPPLY
This circuit
uses a novel approach to produce a fully isolated and
regulated 5 volts @30ma from the 120vac power line. It uses
two tiny SCRs that alternately discharge two capacitors
through a miniature high frequency transformer. The voltage
spikes produced through the transformer are rectified,
filtered and regulated. A very common 8 ohm audio impedance
matching transformer can be used for the transformer.
Published in EDN, Feb. 17, 1992
CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR
This
circuit adds some capacitors and diodes to a traditional
transformer type series regulator circuit to extend the
normal operating range. It can insure regulation during low
line voltage conditions or it can squeeze a few more watts
out of a plug-in-the-wall power adapter power supply.
LOW POWER 12,000 VOLT POWER SUPPLY
If you need about
12,000 volts DC for an ion generator this circuit might be
the ticket. It draws power from the 120vac power line but it
uses a small 6KV camera flash trigger coil. The output
signal is isolated from the power line. Although the circuit
can only deliver about 5uA of current it can produce
dangerous shocks, so be careful.
240VAC TO 5VDC POWER SUPPLY
This is simple way to
power some 5v logic from a 240vac source. If a 120vac
power adapter is used, the circuit will also work for 120vac
power lines.
1.5V to 5V Converter - In many cases can
be very handy to be able to convert 1.5V to
5V. Then you can power microcontroller or
LED from a single AA or AAA battery. It is
simple to do this as there are special IC�s
as MAXIM MAX1674 or MAX7176. This is step-up
DC-DC converter that can convert voltages
from 0.7V to any in range from 2V to 5.5V.
MAX1676 have already preset pins for 3.3V
and 5V, that makes easer integration in 3.3
and 5V circuits. IC can dissipate up to
444mW.
10W HF Linear Amplifier
12 Volt to 9 Volt DC Converter - Car Converter for12
Volt to 9V
122 Volt AC Lamp Dimmer Full Wave SCR
123 VAC Lamp Dimmer (full wave SCR) - The full wave
phase control circuit below was found in a RCA power
circuits book from 1969. The load is placed in series with
the AC line and the four diodes provide a full wave
rectified voltage to the anode of a SCR.
12V DC to 220V 100W Inverter with 4047 IC & IRF540 -
This is 100W inverter circuit. It uses 4047 IC and IRF540
Mosfet instead of 2N3055 transistor. Power output is 100W
from 2-3A transformer.
12V Fluorescent Inverter - Build this 20 watt Fluoro
Inverter, it drives two 20-watt tubes or a 40-watt
tube
12V to 110V/ 220V 500W Inverter - Using this circuit
you can convert the 12V dc in to the 220V Ac. In this
circuit 4047 is use to generate the square wave of 50hz and
amplify the current and then amplify the voltage by using
the step transformer. How to calculate transformer rating
The basic formula is P=VI and between input output of the
transformer we have Power input = Power output For example
if we want a 220W output at 220V then we need 1A at the
output. Then at the input we must have at least 18.3V at 12V
because: 12V*18.3 = 220v*1 So you have to wind the step up
transformer 12v to 220v but input winding must be capable to
bear 20A.
12V to 120V Inverter - Have you ever wanted to run a TV,
stereo or other appliance while on the road or camping?
Well, this inverter should solve that problem. It takes 12
VDC and steps it up to 120 VAC. The wattage depends on which
transistors you use for Q1 and Q2, as well as how "big" a
transformer you use for T1. The inverter can be constructed
to supply anywhere from 1 to 1000 (1 KW) watts.
12V to 220V 100W Inverter - This is a simple 100W
inverter that can be used to achieve 110V or 220V from 12V.
Circuit uses 2N3055 output transistors that are easily
available. Output voltage depends on the type of transformer
being used.
12W AC-DC Flyback converter - Fully assembled and tested
power supply with DC containing all design documentation
Features: Universal AC line input, 0-1A Iout @ 12V, 84%
efficiency at high line, Short Circuit protection, Over
Voltage protection
18v AC to DC Power Supply - This is a classic linear
power supply which produces a regulated 18v, rated at about
1 amp.
240VAC To 5VDC Power Supply - This is simple way to
power some 5v logic from a 240vac source. If a 120vac
power adapter is used, the circuit will also work for 120vac
power lines.
3W HF QRP Linear Amplifier
500mW HF Linear Amplifier
500W Mos-Fet Power Inverter from 12V to 110V/220V -
This circuit will provide a very stable "Square Wave" Output
Voltage. Frequency of operation is determined by a pot and
is normally set to 60 Hz. Various "off the shelf"
transformers can be used. Or Custom wind your own FOR BEST
RESULTS. Additional MosFets can be paralleled for higher
power. It is recommended to Have a "Fuse" in the Power Line
and to always have a "Load connected", while power is being
applied. The Fuse should be rated at 32 volts and should be
aproximately 10 Amps per 100 watts of output. The Power
leads must be heavy enough wire to handle this High Current
Draw
50V 3A Stabilized Power Supply with 2N3055 - Many times
we needed a stabilized, together regulated power supply and
high relatively output voltage. These specifications him it
cover our circuit. It 's a circuit that can give in his exit
+ 40V until + 60V 3A, with simultaneous stabilization. The
materials that use is very simple and will not exist
difficulties in the manufacture, is enough you are careful
certain points. 1 ] For output voltages smaller of + 50V
until + 40V, the Q1 is hot enough, so that it needs one big
heat sink.
6 to 12 Volt Converter (Aaron Cake) - This circuit can
provide up to 800mA of12V power from a 6V supply. The
circuit is simple, about 75% efficient and quite useful.
600 Volt Power Supply - simple 600 Volt DC power supply.
Convert 230V AC to 300V and 600V DC.
60w Ac-DC Flyback Converter - Universal AC line input
Fully assembled and tested power supply with DC containing
all design documentation Features: 0-4A Iout @ 15V, 87%
efficiency at high line, Short Circuit protection, Over
Voltage protection
80V Linear Regulator is Micropower - DN314 Design
Notes (Linear Technology)
90W AC-DC Flyback converter - Fully assembled and tested
power supply with DC containing all design documentation
Features: Universal AC line input, 0-6A Iout @ 15V, 83%
efficiency at high line, Short Circuit protection, Over
Voltage protection
AN-1148: Linear Regulators: Theory of Operation &
Compensation - National Semiconductor Application Note
AN-262: Low-Noise Low Drop-Out Regulator for Portable
Equipment - AN-262 Analog Devices Application Note
AN-60-004 Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 -
Application Note MiniCircuits.com
AN-60-005 Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2
- Application Note MiniCircuits.com
AN-60-009 High IP3, wide band, balanced linear power
Amplifier HELA-10 - Application Note MiniCircuits.com
AN-D10: Off-Line Compact Universal Linear Regulator -
Supertex Semiconductors
AN-D14: LP07 Series: Low Dropout 3.0 Volt Linear Regulator
- Supertex Semiconductors
AN-H22: Customizing the Linear Circuitry Response of HV91
- Supertex Semiconductors
AN-H40: High Voltage Linear Regulator & Constant Current
- Supertex Semiconductors
PWM AC/DC Power Supply Design Apex-AN35 - Apex App Note
Automobile Interior Light Fader - This circuit is
similar to the fading eyes circuit above and is used to
slowly brighten and fade interior lights of older cars. The
circuit is based around the LM324 low power opamp which
draws around 3mA of current, so it won't bother the battery
if left connected for extended periods.
Bidirectionall power inverter - EDN-Design Ideas: If you
want to swap charge in either direction between unevenly
loaded positive and negative battery buses, you need an
inverting dc transformer. One implementation is the
symmetrical flyback converter shown in Figure 1.
Caps Provide Voltage Boost To Series Regulator - This
circuit adds some capacitors and diodes to a traditional
transformer type series regulator circuit to extend the
normal operating range. It can insure regulation during low
line voltage conditions or it can squeeze a few more watts
out of a plug-in-the-wall power adapter power supply.
Circuit Forms Constant Current SCR - EDN-Design Ideas
Circuit offers improved active rectification - EDN-Design
Ideas: Rectifiers convert ac signals to dc. You can combine
a diode and a load resistor to create a half-wave rectifier,
provided that the amplitude of the ac source is much larger
than the forward drop of the diode (typically 0.6V).
Unfortunately, you can't use this method to rectify signals
that are smaller than a diode drop.
Classic Plus & Minus DC Power Supply - This is a classic
example of a regulated DC power supply that produces both a
positive 15v and a negative 15v from a 20vac wall adapter.
CMOS hex inverter generates Low distortion sine waves -
EDN-Design Ideas: Audio signal source uses hex inverter and
handful of passives.
CMOS inverters convert RF to Digital signal - EDN-Design
Ideas: Hex-inverter-based design suits frequencies up to180
MHz.
Customizing the Linear Circuitry Response of HV91 -
Supertex Semiconductors
DC to DC Converter - The circuit below is a DC to DC
converter using a standard 12 VAC center tapped power
transformer wired as a blocking oscillator. The circuit is
not very efficient but will produce a high voltage usable
for low power applications. The input battery voltage is
raised by a factor of 10 across the transformer and further
raised by a voltage tripler consisting of three capacitors
and diodes connected to the high voltage side of the
transformer.
EPR-32: 25 Watt Multiple Output TOP245P Supply - This
design kit is an AC-DC power supply with universal input and
4 outputs. The design, rated for 20 W (25 W peak), is
implemented using a TOP245P device from the TOPSwitch-GX IC
family and an EEL25 core in a flyback topology.
Fast Rectifier Circumvents Input Level Effects - EDN-Design
Ideas: All diode-based rectifier circuits suffer from a
signal-level-dependent frequency response. This response
occurs because the dynamic impedance of the diodes varies as
the signal level changes. The result is a slower frequency
response and distorted rectified outputs at low signal
levels compared with high levels. An alternative approach
Full wave rectifier operates to 200 MHz - EDN-Design
Ideas: The circuit in Figure 1 uses current-feedback
amplifiers to implement a wideband full-wave rectifier for
applications such as a control/AGC system reference or as an
amplitude indicator. Putting the full-wave-rectifier diodes
in the feedback loop of an op amp works better than does
using simple diode-based rectifiers. The op amp's loop gain.
High Efficiency Linear & Switching Solutions for Splitting a
Digital Supply - DN172 Design Notes (Linear
Technology)
High Efficiency Linear Regulators - AN32 Linear
Technology Presents circuit techniques permitting high
efficiency to be obtained with linear regulation. Particular
attention is given to the problem of maintaining high
efficiency with widely varying inputs, outputs and loading.
Appendix sections review component characteristics and
measurement methods.
High IP3, wide band, balanced linear power Amplifier HELA-10
- AN-60-009 Application Note MiniCircuits.com
High Speed Rectifier uses No Diodes - EDN-Design Ideas:
Fig 1 shows a high-speed, full-wave rectifier-or
absolute-value circuit-that uses a high-speed clamping
amplifier, IC2. This circuit is faster and performs better
than rectifiers employing diodes in their amplifiers'
feedback paths. These diode-based circuits have limitations
at lower signal-input levels and higher bandwidths.
High Voltage Linear Regulator & Constant Current -
Supertex Semiconductors
Introduction to Schottky Rectifiers - MicroNote 401 from
Microsem
LB-8: Precision AC/DC Converters - National
Semiconductor Application Note
Linear regulator=Low cost DC/DC converter - EDN-Design
Ideas: The circuit in Figure 1 is a good choice if you need
a power supply with high efficiency and you don't want to
use expensive dc/dc-converter ICs. The heart of the circuit
is IC1, the common, inexpensive LM7805 linear regulator. The
external switch is a pnp transistor; the circuit can easily
source more than 1A output current.
Linear Regulators: Theory of Operation & Compensation -
National Semiconductor Application Note
Low Power 12,000 Volt Power Supply - If you need about
12,000 volts DC for an ion generator this circuit might be
the ticket. It draws power from the 120vac power line but it
uses a small 6KV camera flash trigger coil. The output
signal is isolated from the power line. Although the circuit
can only deliver about 5uA of current it can produce
dangerous shocks
Low-Noise Low Drop-Out Regulator for Portable Equipment
- AN-262 Analog Devices Application Note
LP07 Series: Low Dropout 3.0 Volt Linear Regulator -
Supertex Semiconductors
Miniature Isolated AC/DC Power Supply - This circuit
uses a novel approach to produce a fully isolated and
regulated 5 volts @30ma from the 120vac power line. It uses
two tiny SCRs that alternately discharge two capacitors
through a miniature high frequency transformer. The voltage
spikes produced through the transformer are rectified,
filtered and regulated. A very common 8 ohm audio impedance
matching transformer can be used for the transformer.
MOSFET Switch Provides Efficient AC/DC Conversion - EDN-Design
Ideas
Motor Accu Lader (Dutch language)
Non-isolated Off-line AC to DC Power Supply - This
compact efficient circuit can provide up to 100ma of a
regulated 5 volts from an AC power source ranging from 20vac
to 120vac.
Off-Line Compact Universal Linear Regulator - Supertex
Semiconductors
Off-Line Power Supply Does Not Require Filtering to Meet FCC
Emission Requirements - DN175 Design Notes (Linear
Technology)
One 9 Volt Battery gives +18 +25 +33V - This circuit is
based on MAX1044 is a charge pump converter.
One Watt 2.45 GHz Linear Amplifier
OpAmp Rectifier Signals Input State - EDN-Design Ideas:
The op-amp rectifier in Fig 1 operates from a single supply
and provides a logic output and an LED that indicate the
state of the input voltage. The input-state indications are
handy for calibration. Because the circuit operates from a
single supply, the 2.5V reference determines the level
around which the circuit rectifies input waveforms.
Output Adjustable Flyback Converter
Precision AC/DC Converters - National Semiconductor
Application Notes
Precision full wave Signal rectifier needs no diodes -
EDN-Design Ideas: Single-supply design uses two op amps.
Precision Rectifier is Glitch Free to 1 MHz - EDN-Design
Ideas: The manufacturer’s circuit for a precision,
current-mode, full-wave rectifier (Fig 1a)converts a voltage
signal to a current, eliminating errors arising from voltage
drops across the rectifying diodes. However, just like
op-amp-based rectifiers, the circuit
Precision Rectifier Reduces Ripples - EDN-Design Ideas:
You can use a lowpass filter to simultaneously increase a
rectifier's speed and reduce or maintain the ripple voltage.
The input voltage of the precision rectifier in Figure 1a is
100 mV at a frequency of 50 Hz. The output with C1 equal to0
is a double phase-rectified voltage of R2/R1.
PWM AC/DC Power Supply Design Apex-AN35 - Apex App Note
Rectifier tracks positive & negative peaks - EDN-Design
Ideas: Versatile precision rectifier also delivers full-wave
output
Run Switching Type AC Power Adapters on DC - I have
received a couple emails from people looking for inexpensive
DC to DC converters, which can convert 40v to 60v DC into
say +5 or +12v. Such input voltages are often found in
new automotive and industrial applications with a typical DC
voltage of 48 volts. It turns out that many, not all, but
many, standard AC line operated power adapters, which use
switch mode techniques, will indeed work great when supplied
with DC instead of AC. The unit below works down to about
30v DC and delivers 500ma at 5v. If you draw less current,
it will operate at even lower DC input voltages.
SCR Voltage Regulator - Though not as accurate as a
linear or a high-frequency switching regulator, an SCR
voltage regulator wastes little power and creates no RFI.
Designed by Andrew R. Morris
Silicon Controlled Rectifier Model Railroad Throttles &
London Model Railroad Group SCR Throttle
Step Down Rectifier Makes a Simple DC Power Supply - EDN-Design
Ideas: -- A simple and useful nonisolated
rectifier features voltage step-down operation, acceptable
Class A line-current harmonics, inherent short-circuit
protection, and, optionally, a regulated output.
Supply uses AC to generate 5V Power on reset - EDN-Design
Ideas: The need often arises for a low-cost logic supply for
powering microcontrollers and related circuitry in
"white-goods" products, such as industrial controllers and
sensors. These applications usually include 24 or 115V ac or
higher levels of ac voltage for conversion to 3.3 or 5V dc.
The simplest approach to generating low-current.
Thermostat for 1KW Space Heater SCR controlled - Here is
a simple thermostat circuit that can be used to control a
relay and supply power to a small space heater through the
relay contacts. The relay contacts should be rated above the
current requirements for the heater.
Transformerless Power Supply (Aaron Cake)
Transformerless Power Supply (jose pino) - Simple, low
cost and easy to build power supply. Ideal for applications
that doesn't require too much power. (5/28/2006)
Transformerless Power Supply (Len Galasso) - This power
supply uses the reactance of a non-polarized capacitor at
60hz to step-down the voltage from the normal 117VAC level
to about 20 volts or so, which is rectified by the diode.
Transient Protection of Darlington gain block Amplifiers
- AN-60-034 Application Note MiniCircuits.com
True RMS Detector - National Semiconductor Application
Notes
Two OpAmps Make Fast Full Wave Rectifier - EDN-Design
Ideas: The circuit in Figure 1 is a precision full-wave
rectifier with the following characteristics: Minimal delay
time between the input and output (with only one op amp in
the chain); Similar delay times for positive and negative
inputs; No need to match diodes or adjust resistors.
When VIN>0V, the output of op amp IC1 is negative.
Ultra Low Drop Linear Regulator
Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2 -
AN-60-005 Application Note MiniCircuits.com
Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 - AN-60-004
Application Note MiniCircuits.com
Unregulated power supply - A basic full wave rectified
power supply is shown below. The transformer is chosen
according to the desired load. For example, if the load
requires 12V at 1amp current, then a 12V, 1 amp rated
transformer would do. However, when designing power supplies
or most electronic circuits
Uses & Advantages of MERA Dual Matched MMIC Amplifiers -
Application Note MiniCircuits.com
Using the Catalog Specifications to Determine MMIC
Reliability - AN-60-030 Application Note
MiniCircuits.com
Very Low Dropout VLDO Linear Regulators Supply Low Voltage
Outputs - DN292 Design Notes (Linear Technology) |
