Circuit Diagram

Charger for NiCd Batteries

Published:2013/3/22 2:12:00 Author:Ecco | Keyword: Charger, NiCd Batteries

This device is used to simultaneously charge for Ni-Cd batteries. The output step-down transformer AC 12V is fed to the rectifying diode bridge, assembled on a 4-diode 1N4007. Smooth capacitor C3 constant voltage supplied to the chip 7808 , the output of which will be regulated voltage 8 V. The transistor T1 ( BC547 ), incorporated on the emitter follower circuit is used as a voltage regulator, which determines the charge current. The magnitude of this current can be adjusted by potentiometer VR2, or use a switch with three trimmer, each of which is exposed to the desired charge current (90 mA, 180 mA and 300 mA). (The figure lower conclusions potentiometer must be connected). If you want to have the batteries recharged very quickly, select the charge current of 300 mA, the charging time is about 30 minutes. Light-emitting diodes LED1 … LED4 are indicators of the charge, they shine only when a battery charging current flows. On transistors T2 … T5 made ​​permanent sources of charging current. The integrated regulator IC1, install the heat sink.   (View)

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5 Volt TTL Voltage Monitor

Published:2013/3/22 2:12:00 Author:Ecco | Keyword: 5 Volt, TTL, Voltage Monitor

This is a simple device designed to control supply voltage +5 V Monitor provides information signals TTL level, accompanied by the LED display, indicating that stress or deviated from the nominal value, or vice versa, is in a “box”. The basis of the device is a low-current window comparator IC LTC1042 company Linear Technology . The reference voltage is 2.5 V ± 0.005 V for the middle “window” created by zener D1 and fed to pin 2 comparator. The width of this “window” equal to 20% (± 10%) of the reference voltage established at pin 5 chip divider R4, R5. The controlled voltage is divided by two resistors R2 and R6, and fed to pin 3 of the chip. Voltage at the terminals 2 and 3 are compared with the established view of the deviation (10%, output 5). The green LED D2 is illuminated when the voltage is within the desired range. If the voltage is out of range, red LED D3.   (View)

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5V Switch Mode Power Supply using LM2674

Published:2013/3/22 2:11:00 Author:Ecco | Keyword: 5V, Switch Mode , Power Supply

In the typical power supply is used in chip LM2674 company National Semiconductor , for many years engaged in manufacturing and designing components for the pulse transformers. LM2674 can be used instead of a chip LM2671 . By choosing different versions of chips, you can collect the converter with a constant (3.3, 5 or 12V) or with an adjustable output voltage. The above scheme gives a current of 500 mA. Note that the dignity of these components is the high switching frequency – 260 kHz, allowing the use of inductors and capacitors small denominations, to achieve high efficiency and small size of the converter. Under normal conditions, the efficiency is 90%, and in some cases, can reach even up to 96%. Both devices are protected against overcurrent and overheating. LM2671 has a number of additional features such as soft start and the opportunity to work with an external generator. The latter allows to synchronize multiple converters, which significantly reduces the noise created by them and ensure compliance with any requirements of electromagnetic compatibility (EMC). Shown in Figure converter provides output voltages of 5V and current up to 500mA. Schottky diode D1 must withstand reverse voltages of at least 45V and a maximum forward current of 3 A.   (View)

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5 volt Charger based LNK616PG Chip

Published:2013/3/22 2:10:00 Author:Ecco | Keyword: 5 volt Charger, Chip

On-chip LNK616PG of LinkSwitch-II family firms Power Integrations can be designed very simple battery charger with mains supply, which can operate in either stabilizing the voltage and current stabilization mode. The device can be used for charging mobile phones or other electronic devices that consume less than 5 watts. LNK616PG chip was developed for use in the budget of low-voltage chargers and network adapters. This controller provides precise control of output voltage and current for a small number of external components, and characteristically, without the use of optocouplers.   (View)

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Simple Converter to Power UV Lamp

Published:2013/3/22 2:05:00 Author:Ecco | Keyword: Simple Converter , Power , UV Lamp

This simple converter to power UV lamp scheme is a simple converter to power the ultraviolet lamp low voltage. The power supply can be applied using the 6 batteries of 1.5V or a power supply with an output current of at least 1 A / 8V voltage outout.   (View)

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Adjustable Voltage Regulator 3 Ampere

Published:2013/3/22 2:04:00 Author:Ecco | Keyword: Adjustable Voltage Regulator, 3 Ampere

In this scheme, adjustable voltage regulator IC 78L05 is used in conjunction with the integrated audio amplifier TDA2030 . Because of this, the stabilizer was very simple. The output voltage is regulated to 20 V with maximum current of 3 A. IC TDA2030 is protected against overheating and short circuits, making it a very reliable regulator. This scheme is very simple. Besides the two chips, stabilizer actually contains only two potentiometers and several capacitors. Adjustment is as follows: first, the engine turns potentiometer P1 to the maximum (in the direction of IC 78L05), and then the trimmer P2 is set to the desired maximum output voltage. Subsequently, the potentiometer P1 is used for fine adjustment of output voltage from this maximum value and practically to 0.   (View)

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Charger for Li-ion battery based LP2951

Published:2013/3/22 2:03:00 Author:Ecco | Keyword: Charger , Li-ion battery

Stabilizer LP2951 manufactured by National Semiconductors. Element values ​​are taken from the article “Charging”, written by Chester Simpson. Diode D1 can be any of a series of 1N400x, which can be purchased. It is used as a lock, to prevent reverse current from the battery to the chip LP2951 when disconnecting the input voltage. The current charge is about 100 mA, and this value is the maximum current is limited to the internal circuits chips LP2951. For those who are interested, let us explain that any lithium-ion battery can be recharged up to charge current 1C (ie, the current in mA equivalent capacity in mAh, so that, for example, the battery capacity of 1100 mAh can be recharged current to 1100 mA). The lower charge current leads, respectively, to more charge time. In my humble opinion, 100 mA – relatively low charging current, so that the typical lithium-ion battery can be connected to this charger for the night.   (View)

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Xbox 360 Power Supply by Intec

Published:2013/3/22 1:59:00 Author:Ecco | Keyword: Xbox 360, Power Supply

In the market there is an Xbox 360 power supply made ​​by Intec, which is designed specifically for use suited with the Xbox 360. Novelty has several features that are not available on the normal network Xbox 360 adapter. In particular, the device has a built-in cooler that promises to reduce the operating temperature of the platform, three LED-indicator, informing you of the state apparatus, and the half-meter cable. Connected device is simple and requires no additional configuration. Xbox 360 Power Supply from INTEC sold in the market not more than U.S. $ 100 and comes with no wires connected to the outlet.   (View)

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The Terman oscillator circuit

Published:2013/3/21 4:19:00 Author:Ecco | Keyword: Terman oscillator

J-FET is connected between the resistors R3 and R4 in the Wien bridge, and it uses transistor to replace operational amplifier , this circuit is called Terman oscillation circuit.   (View)

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Broadband-segment Venturi bridge oscillator

Published:2013/3/15 2:22:00 Author:Ecco | Keyword: Broadband-segment, Venturi, bridge , oscillator

Broadband-segment Venturi bridge oscillator is shown as figure.   (View)

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Adjustable frequency multivibrator

Published:2013/3/14 1:50:00 Author:Ecco | Keyword: Adjustable frequency multivibrator

Adjustable frequency multivibrator is shown as figure.   (View)

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The capacitive adjustable Wien bridge oscillator with op amp CA3130

Published:2013/3/14 1:09:00 Author:Ecco | Keyword: capacitive adjustable, Wien bridge oscillator

The capacitive adjustable Wien bridge oscillator with op amp CA3130 is shown as figure.   (View)

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T -bridge oscillator circuit

Published:2013/3/14 1:36:00 Author:Ecco | Keyword: T -bridge oscillator

T -bridge oscillator circuit is shown as figure.   (View)

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Unijunction transistor oscillator circuit

Published:2013/3/19 2:29:00 Author:Ecco | Keyword: Unijunction transistor oscillator

Unijunction transistor oscillator circuit is shown as figure.   (View)

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Simplest adjustable duty cycle oscillator

Published:2013/3/19 2:28:00 Author:Ecco | Keyword: Simplest adjustable , duty cycle, oscillator

Simplest adjustable duty cycle oscillator is shown as figure.   (View)

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Precision pulse oscillator

Published:2013/3/19 3:44:00 Author:Ecco | Keyword: Precision pulse oscillator

Precision pulse oscillator is shown as figure.   (View)

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Accurate reference clock oscillator circuit

Published:2013/3/19 2:34:00 Author:Ecco | Keyword: Accurate reference , clock oscillator

Accurate reference clock oscillator circuit is shown as figure.   (View)

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Programmable pulse width generator circuit

Published:2013/3/19 3:42:00 Author:Ecco | Keyword: Programmable, pulse width generator

Programmable pulse width generator circuit is shown as figure.   (View)

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Car charger for Nicd Battery Packs

Published:2013/3/21 4:15:00 Author:Ecco | Keyword: Car charger , Nicd Battery Packs

The Car charger for Nicd Battery Packs circuit is very suitable for portable charger, with a few components, allows you to build them in a small case. The number of silicon diodes across the Car charger output is determined by the voltage of the battery pack.Figure each diode at 0.7 volt. For example, a 10.9- volt pack would require 10.9/0.7 = 15.57, or 16 diodes.   (View)

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Nicd Charger Uses LEDs Constant Current

Published:2013/3/21 4:02:00 Author:Ecco | Keyword: Nicd Charger , LEDs , Constant Current

This Nicd charger circuit diagram is another simple NiCd battery charger, and I think its very interesting because uses LEDs to adjust the charging current. As mentioned above, this Nicd charger circuit uses constant current LEDs to adjust charging current. It makes use of LEDs that pass a constant current of about 15 -mA for an applied voltage range of 2-18 V.They can be paralleled to give any multiple of 15 mA and they light up when current is flowing. The circuit will charge a single cell at 15, 30 .or 45 mA or cells in series up to the rated supply voltage limit (about 14 V).   (View)

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