Schematic Rise

Saturday, September 13, 2014

Ampere or Current Booster

Small and very useful schema, Can be built on a veroboard

Volt regulators such as the LM708, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle. If that is the case, this little schema can help out. A power transistor such as the 2N3772 or similar can be used.

The power transistor is used to boost the extra needed current above the maximum allowable current provided via the regulator.
Current up to 1500mA(1.5amp) will flow through the regulator, anything above that makes the regulator conduct and adding the extra needed current to the output load. It is no problem stacking power transistors for even more current. (see diagram). Both regulator and power transistor must be mounted on an adequate heatsink.

Circuit diagram:

Ampere or Current Booster Circuit Diagram

Parts:

R1 = 1R-2W
R2 = 10R-2W
C1 = 35v-470uF
C2 = 35v-470uF
Q1 = TIP2955
IC1 = 78xx Regulator

TDA8950 Audio Amplifier 2x150W

TDA8950 general description:

The TDA8950 is a high-efﬁciency Class D audio power ampliﬁer. The typical output power is 2 × 150 W with a speaker load impedance of 4 Ω. The TDA8950 is available in both HSOP24 and DBS23P power packages. The ampliﬁer operates over a wide supply voltage range from ±12.5 V to ±40 V and features low quiescent current consumption. TDA8950 Audio Amplifier 2x150W

TDA8950 features:

Pin compatible with TDA8920B for both HSOP24 and DBS23P packages
Symmetrical operating supply voltage range from ±12.5 V to ±40 V
Stereo full differential inputs, can be used as stereo Single-Ended (SE) or mono
Bridge-Tied Load (BTL) ampliﬁer
High output power in typical applications:
SE 2 × 150 W, RL
4 Ω (VP = ±37 V)
SE 2 × 170 W, RL
4 Ω (VP = ±39 V)
SE 2 × 100 W, RL
6 Ω (VP = ±37 V)
BTL 1 × 300 W, RL
8 Ω (VP = ±37 V)
Low noise
Smooth pop noise-free start-up and switch off
Zero dead time switching
Fixed frequency
Internal or external clock
High efﬁciency
Low quiescent current
Advanced protection strategy: voltage protection and output current limiting
Thermal FoldBack (TFB)
Fixed gain of 30 dB in SE and 36 dB in BTL applications
Fully short-circuit proof across load
BD modulation in BTL conﬁguration

Amplifier diagram, circuit for TDA8950:

TDA8950 circuit diagram

Datasheet for TDA8950: Download

12 Volt 2 A Switching Power Supply Wiring diagram Schematic

This is a Simple 12 Volt / 2 A Switching Power Supply Circuit Diagram. The schema 12 volt / 2 A switching power supply in the above scheme is not too complicated. At the output of this block provides a stable 12 V and maximum current 2A. Power supply units are quite compact and is suitable for debugging schemes, as well as a permanent resource for stationary devices, including power for the logic electronics for the home-made CNC machine tools.

12 Volt / 2 A Switching Power Supply Circuit Diagram

Transformer is available in the free market and avoids the hassle of having to self-winding. The diode bridge BR 1 of any given voltage and current of 2A. All other elements in the high part of the schema are designed by the same voltage, taking into account the mains. The scheme of 12 volt / 2 A switching power supply operates from the high voltage network, to be observed when mounting accuracy and caution when using. It is desirable to block the finished board to “pack” in the body.

Sourced By : Circuitsstream

Friday, September 12, 2014

LM1758 A Switching Regulator Circuit

The National Semiconductor LM 1578 A is very a switching regulator Which should easily be set up for such dc-to-dc voltage .conversion circuits as the buck, boost, and inverting configurations. The LM 1578 A features a distinctive comparator input stage Which not just} has separate pins for both the inverting and non-inverting inputs, but as well offers an internal 1.0 V reference to every input, thereby simplifying circuit design and PC board layout.

The output can switch upto 750 m A and has output pins for its collector and emitter to market design flexibility. An external current limit terminal tend to be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM 1578 A has an on board oscillator, Which sets the switching frequency with other a single external capacitor in one < 1 Hz to 100 kHz (typical). It operates in one supply voltages of 2 V to 40 V. its really provided with other current limit and thermal shutdown. Duty cycle up to 90 %. Functional diagram is given in figure.

300W Subwoofer Amplifier

Battery Charger Indicator Circuit

Most of you asked about a Battery Charger Indicator Circuit.This schema indicates weather battery is charged or not.This schema avoid the over charge of batteries purple LED will indicate the battery is charging.After charging purple LED is off.

Simple 3 Input and Gate Comparator Wiring diagram Schematic

This is a Simple 3 Input and Gate Comparator Circuit Diagram. This schema has high output only when all three inputs are high. The non inverting-input current, when all three inputs are high, must exceed that of the inverting input, as determined by R4. The schema can be converted to a AND gate by transposing the two inputs of the op amp.

3 Input and Gate Comparator Circuit Diagram