Showing posts with label power. Show all posts
Showing posts with label power. Show all posts
Tuesday, September 24, 2013
Car Bulb Power Flasher
Derived from the Two-wire Lamp Flasher design, hosted on RED Free Circuit Designs since 1999, this astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet.
Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply is not available but a powerful flashing light is yet necessary.
Circuit Diagram:
Car Bulb Power Flasher Circuit Diagram
| Parts | Description |
| R1 | 6.8K |
| R2 | 220K |
| R3 | 22K |
| C1 | 100uF-25V |
| C2 | 10u-25V |
| D1 | 1N4002 |
| Q1 | BC557 |
| Q2 | IRF530 |
| LP1 | 12V-21W Car Filament Bulb (See Notes) |
| SW1 | SPST Switch (3 Amp minimum) |
Notes:
- Flashing frequency can be varied within a limited range by changing C1 value.
- As high dc currents are involved, please use suitably sized cables for battery and bulb(s) connections.
Source : www.redcircuits.com
Monday, September 2, 2013
2x6W Stereo Audio Amplifier based LA4440 Power IC
This is the diagram of 2x6W stereo audio amplifier based LA4440 power IC. Actually, the LA4440 can be used in both stereo mode and mono (bridge) mode, but the circuit presented in this post is LA4440 in stereo mode. The recommended power supply is 13.2V, while the maximum voltage rated at 18V.
LA4440 Features:
- Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications.
- Dual : 6W´2 (typ.)
- Bridge : 19W (typ.)
- Minimum number of external parts required.
- Small pop noise at the time of power supply ON/OFF and good starting balance.
- Good channel separation.
- Good ripple rejection : 46dB (typ.)
- Low distortion over a wide range from low frequencies to high frequencies.
- Small residual noise (Rg=0).
- Easy to design radiator fin.
- Built-in protectors.
- Built-in audio muting function.
- Thermal protector
- Overvoltage, surge voltage protector
- Pin-to-pin short protector
Wednesday, May 29, 2013
An Alternative Approach to Higher Power Boost Converters
This is a design circuit for high power boost converter circuit. This circuit is control by LM25037 Single chip IC. This circuit is a simple straightforward approach that can provide benefits over using a typical single gate-drive controller. This is the figure of the circuit;
The benefits can include higher step-up ratios and lower FET losses due to the reduction in transitional losses. Although there are a number of possible approaches to reduce total FET losses in higher-power boost converters, the equations in this article can be used to calculate total losses in the boost FETs for a number of different approaches. Considering the 150W boost converter example, it has been shown that total losses in the FETs are reduced when comparing the LM25037 dual-output gate-drive controller with the LM5020 single-output gate-drive controller.
[Schematic diagram source: National Semiconductor Notes]
Friday, May 17, 2013
Power Supply AM Farm Radio
Power Supply AM Farm Radio Circuit DiagramThe affection of the ability accumulation is a Tamura 3FD-410 5V bifold primary/dual accessory transformer. These are accessible from DigiKey.com for reasonable prices. Normally, the transformers primary windings would be affiliated in alternation for 240VAC operation or in alongside for 120VAC operation. This ambit takes one of the primaries and repurposes it as a 120VAC secondary. For this to work, the agent should be somewhat over-rated, which it is in this case.
The two 5V accessory windings are accumulated in alongside and beatific to a arch rectifier and clarify capacitor to aftermath about 7VDC. This DC voltage is current-limited by a 150 ohm resistor and acclimated to drive two amber LEDs. The LEDs can be hot-glued to the central of the radio aloft the punch to accommodate punch lighting and power-on indication.
The 7VDC is additionally beatific to an LM317 adjustable voltage regulator IC. The LM317 commonly produces a minimum voltage of 1.7V, which is too aerial for this application. A alternation 1N4002 diode is acclimated to bead about .5V to aftermath a minimum voltage of 1.2V. The regulator is adapted so that the filaments accomplish at 1.5VDC.
The 90VDC B+ accumulation uses a arch rectifier beyond the transformers additional primary ambagious to aftermath about 160VDC. The rectified DC is filtered through a brace of electrolytic capacitors and a alternation resistor. The resistor drops the B+ voltage to the appropriate 90V.
Via : www.solorb.com
Wednesday, May 15, 2013
Compact 150 240 W Power Supplies offer up to 200 peak power
September 10, 2012 - Exhibiting 91% efficiency, TDK-Lambda ZWS-BP series has universal 85-264 Vac, 47-63 Hz input; can operate with DC input over 120-370 Vdc range; and offers outputs of 24, 36, or 48 Vdc. These open-frame, single-output power supplies, able to withstand 3 kVac input-to-output, have profiles from 1.46-1.65 in. and occupy 2.95 x 6.3 in. or 3.31 x 7.09 in. footprint. With convection cooling, RoHS-compliant products provide up to 150 or 240 W of output.
DK-Lambda Unveils Compact 150 & 240 Watt Power Supplies with up to 200% Peak Power
Convection Cooled (No Fans) - 91% Efficient - For Industrial, ITE, Comms & Kiosk Applications
San Diego, CA - TDK Corporation announces the new TDK-Lambda ZWS-BP series of compact, open-frame, 150W and 240W power supplies. These single-output supplies have a low profile of 1.46" to 1.65" and compact footprints of 2.95" x 6.3" or 3.31" x 7.09". Moreover, these units can provide a peak output power of up to 200% (for motors, pumps, etc.), making them an ideal choice for applications in industrial, gaming, point-of-sale, test & measurement, LED signage, and communications equipment.
These new TDK-Lambda AC-DC supplies feature a universal 85-264Vac, 47-63Hz input, enabling them to be used anywhere in the world. The ZWS-BP is designed to withstand 3kVac, input-to-output. In addition, they can operate with a DC input over the range of 120-370Vdc. The supplies are available with an output voltage of 24V, 36V or 48Vdc and include an onboard output adjustment potentiometer.
With convection cooling (no fans required), these supplies provide up to 150 or 240-watts of output power. The operating temperature range is from -10°C to +70°C with derating above +50°C. The output is floating so it can be used as either a positive or a negative polarity. The power-saving efficiency is up to 91%. Standard features include overvoltage and overcurrent protections. Optional remote On/Off connections are available to allow for remote control of the supply.
The ZWS-BP series is an extension of the very successful ZWS series, which were employed in the high-definition Diamond Vision video displays that were built by Mitsubishi Electric and have been used to power some of the worlds largest LED displays located at the Cowboys Stadium (Texas), Yankee Stadium (New York) and many other global sites. TDK-Lambda power supplies were selected for their long-term reliability and quality.
The ZWS-BP series feature global ITE and general purpose safety agency certifications per UL/CSA/EN60950-1, EN50178 (OV II), are CE Marked, meet the conducted and radiated EMI requirements of EN55011/EN55022-B, VCCI-B and FCC Class B, which is much tougher than Class A. These units are RoHS compliant and include a 5-year warranty, which is one of the longest-term warranties available in this power range.
Saturday, April 13, 2013
Variable 0 to 300 Volts Regulated Power Supply Circuit Diagram
This power supply can be used to obtain a regulated power output, variable right from zero to 300 volts maximum. All the devices should be mounted on heatsinks.
You must have come across many power supply circuits which are designed for supplying anywhere between 0 to 25 or at the most 40 volts DC, but the circuit presented here will give you a robust power right from 0 to 300volts continuously variable.
The circuit diagram can be understood with the following points:
As can be seen in the figure, a high voltage transistor BF458 is used as the main load handling device.
Its base bias is controlled by another high voltage transistor BF337 whose emitter is clamped to a stable 24 volts.
An FET is used for selecting the base current of the transistor BF337 via a pot of 1M.
This setting adjusts the base current for the BF337 which in turn restricts the main transistor BF458s voltage and current flow to the output.
The input to the circuit may be derived directly from the mains AC after proper rectification and filtration using a bridge network and a 10u/400V capacitor.
The entire circuit is extremely dangerous to touch, due care should be maintained while making and testing this circuit.
You must have come across many power supply circuits which are designed for supplying anywhere between 0 to 25 or at the most 40 volts DC, but the circuit presented here will give you a robust power right from 0 to 300volts continuously variable.
The circuit diagram can be understood with the following points:
As can be seen in the figure, a high voltage transistor BF458 is used as the main load handling device.
Its base bias is controlled by another high voltage transistor BF337 whose emitter is clamped to a stable 24 volts.
An FET is used for selecting the base current of the transistor BF337 via a pot of 1M.
This setting adjusts the base current for the BF337 which in turn restricts the main transistor BF458s voltage and current flow to the output.
The input to the circuit may be derived directly from the mains AC after proper rectification and filtration using a bridge network and a 10u/400V capacitor.
The entire circuit is extremely dangerous to touch, due care should be maintained while making and testing this circuit.
Thursday, April 11, 2013
Simple 30V Variable Power Supply Using LM317
This 30v variable power supply circuit is based on LM317 voltage regulator circuit . This LM317 30v variable power supply circuit can deliver high current (around 5 amps) and variable output voltage between 1.2 volts, up to 30 volts. The led D3 mounted on pin 6 at lm301 lights in constant current mode .
Circuit diagram
Circuit diagram
Current limit can be adjusted using R2 potentiometer and the output voltage can be adjusted from 1.2 volts to 30 volts using R8 potentiometer . Input voltage for this variable power supply must be around 35 volts .For this power supply circuit you need to use LM317K circuit (in to3 package ) which must be mounted on a heatsink .
11 W Stereo or 22 W Mono Power Amp
Integrated AF power amps have seen great improvements in recent years offering improved power and easier use. The TDA1519C from Philips contains two power amplifiers providing 11 W per channel stereo or 22 W mono when the two channels are connected in a bridge configuration. The special in-line SIL9P package outline allows the chip to be conveniently bolted to a suitable heatsink. The TDA1519CSP is the SMD version, in this case the heat sink is mounted over, and in contact with, the top surface of the chip.
11W Stereo Amplifier Circuit Diagram The operating voltage of this device is from +6V to +17.5V. The two channels of the amplifier are different in that one channel, between pins 1 and 4, is a non-inverting amplifier, while the other between pins 9 and 6 is an inverting amplifier. It is therefore necessary in stereo operation, to wire the speakers so that one of them has its polarity reversed. Each amplifier has an input impedance of 60kΩ and a voltage gain of 40dB, i.e. 100 times. When both amplifier are used in a bridge configuration, the inputs are in parallel so that the input impedance will be 30kΩ.
22W Stereo Amplifier Circuit Diagram A combined mute/standby function is provided on pin 8. In its simplest form this can be connected to the positive rail via a switch. When the switch is open the amplifier will be in standby mode and current consumption is less than 100µA. When the switch is closed, the amplifier will be operational. A circuit is also shown that uses the mute input to prevent the annoying switch-on plop heard when power amps are first switched on This is caused by the rush of current to charge capacitors C1 and C2.
Mute/Standby Switch Circuit Diagram
The circuit shown generates a ramp voltage, which is applied to pin 8. At switch on, as the voltage rises from 3.3 V to 6.4 V, the amplifier will switch out of standby mode and into mute mode allowing C1 and C2 to charge. Only when the ramp voltage on pin 8 reaches 8.5V will the amplifier switch into active mode. Protection built into the TDA1519C would seem to make it almost foolproof. The two outputs can be shorted to either of the supply rails and to each other. A thermal shutdown will prevent overloading and the power supply input is protected against accidental reversal of the supply leads up to 6V.
Author : G. Kleine - Copyright : Elektor Electronics
Wednesday, April 10, 2013
100W POWER AMPLIFIER USING TDA7293 CIRCUIT DIAGRAM
100W POWER AMPLIFIER USING TDA7293 CIRCUIT DIAGRAM
The TDA7293 amplifier specifications might lead you to believe that it can use supply voltages of up to ±50V. With zero input signal (and therefore no output) it might, but I dont recommend anything greater than ±35V if 4 ohm loads are expected, although ±42V will be fine if you can provide good heatsinking. In general, the lower supply voltage is more than acceptable for 99% of all applications, and higher voltages should not be used unless there is no choice. Naturally, if you can afford to lose a few ICs to experiments, then go for the 42V supplies (obtained from a 30+30V transformer).
1957 58 Dodge 4 Way Power Seat Wiring Diagram
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| 1957-58 Dodge 4-Way Power Seat Wiring Diagram |
(click for full size image)
The Part of 1957-58 Dodge 4-Way Power Seat Wiring Diagram:4 way seat adjusting switch, 30 amp circuit breaker, horizontal adjusting unit, battery,
Tuesday, April 9, 2013
Power Supply Failure Alarm
Most of the circuit power supply failure alarm circuits require additional or external power supply. However, this circuit requires no additional power supply. The circuit uses a voltage of 5 volts to 15 volts. To adjust the voltage of this circuit, first connect the power source (5 to 15V) and change the position of potentiometer VR1 until the buzzer buzzer On to Off position.
If the power supply fails, resistor R2 will bias the transistor and the base will turn on the buzzer. Here is a picture series of power supply failure alarm : |
| Power Supply Failure Alarm Circuit |
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