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Application Circuit:  2.1W Audio Power Amplifier Circuit Datasheet for AN7148: Download

LA4440 This is a very simple circuit power amplifier with IC LA4440. This circuit is a circuit the first time i learned to make a power amplifier. Power output 2 X 20 Watt with stereo speakers. Minimum Voltage 9 Volt and maximum voltage 24 V. The Circuit is also very easy to make. For novices , this circuit is suitable for use . The material is also readily available at electronics store.  See schematic below : The Speaker are matched with woofer speaker with impedance 4 Ohms. And voltage can be stabilized with IC 7812 but must be reinforced such us transistor.

Volt meters & ampere meter with PIC can be used to measure voltage and current simultaneously. The series of volt meters & ampere meter with PIC16F876A PIC is used as a data processor voltage and current are measured.  This circuit uses the viewer in the form of 16 × 2 LCD used for the data display voltage and current measurements. In the article volt meter and ampere meter with PIC are discussed kerannya limited to devices only. More detail can be seen from the image sequence volt meter and ampere meter with PIC below.  The images of Volt Meter & Ampere Meter With PIC Circuit Volt meters & ampere meter with PIC  

The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4. The moment too much current is flowing biases Q1 and drops the output voltage. The output voltage is: 1.2 x (P1+R2+R3)/R3 volt. Current limiting kicks in when the current is about 0.6/R1 amp. For a 6-volt battery which requires fast-charging, the charge voltage is 3 x 2.45 = 7.35 V. (3 cells at 2.45v per cell). So the total value for R2 + P1 is then about 585 ohm. For a 12 V battery the value for R2 + P1 is then about 1290 ohm.  For this power supply to work efficiently, the input voltage has to be a minimum of 3V higher than the output voltage. P1 is a standard trimmer potentiometer of sufficient watt for your application. The LM317 must be cooled on a sufficient (large) coolrib. Q1 (BC140) can be replaced with a NTE128 or the older ECG128 (same company). Except as a charger , this circuit can also be used as a regular power supply . Parts ...

  As is always the case with a two-way active monitor, each B2031 is equipped with two separate power amplifiers – one for the low frequency driver and one for the tweeter (150 watts and 75 watts respectively).  The low frequency polycarbonate driver is 22cm in diameter and the high frequency duties are handled by a one-inch ferofluid-cooled titanium dome tweeter. The crossover circuitry consists of an active fourth-order witz-Riley filter kicking in at 2kHz. The enclosure also employs a bass reflex porting system to extend the low frequency drivers’ overall frequency response down to a quoted 50Hz.  Other features of the B2031s worthy of note include: protection circuitry to look after the drivers and amplifiers in the event of overload; and electromagnetic shielding to allow close placement of the B2031’s to TV screens and computer monitors without interference. At the back of the B2031s you’ll find a metal amplifier housing which extends about an inch or so beyond the ...

DC- 2 Audio Amplifier Circuit Diagram . Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the complication of a second (symmetric) power supply; another is good frequency and phase response. Also, no special electrolytic capacitors are needed for voltage stabilisation, and switch-on ‘thump’ is much reduced. To try to rescue this class of circuit from obscurity the author has designed a headphone amplifier working along the lines illustrated in Figure 1. . Circuit diagram DC-Coupled Audio Amplifier Circuit Diagram It consists of a voltage divider, a voltage follower and the loudspeaker in the headphones, whose other side is connected to the junction of two electrolytic capacitors, providing the virtual earth. The potential at this point is, of course, half the supply voltage. All we need to do now is suitably couple in the audio signal to be amplified. Fig...

Well the sun’s out again, so let’s get back to work on our cigar box guitar (part one is here: http://diystrat.blogspot.com/2012/06/making-cigar-box-guitar-part-1.html). The next step is to shape the peghead. If we just kept this the same height as the rest of the neck, the strings wouldn’t have any downward pull after passing over the nut and would likely jump about all over it, or buzz, etc. Another consideration is how long the tuner shafts are. Besides, the neck is just too thick for the tuners to reach all the way through anyway. The neck is currently about 25 mm thick, so I’ve elected to take 10 mm off the top, leaving us with a thickness of 15 mm. First I mark the depth I’m going to cut off: Then I do the main cutting very carefully with a wood saw. And then I add a taper near the nut. It turns out pretty nicely if you’re careful, and only requires a bit of sanding to smooth things out. Next, we’re going to deal with the tuners. Firstly we mark where the strings will be if ...

This circuit use the IC AN7166  . On circuit have an advantage is very loud sound , although only 30W this circuit is like a 100 W transistor power amplifier. Its so good circuit with IC AN7166 . This circuit require minimum voltage 12 V and Maximum voltage 24 volt , I recomended voltage for this circuit is 18 volt. And use the battery supply current 5 Ampere. Maximum power output of one speaker 30 W with impedance 4 Ohm. See this circuit schematic below : Click image to view large Capacitor thats connect legs IC 4 and 3 is 1 nF . And capacitor thats connect legs IC 9 and 3 is 1 nF. For the input capacitor at 1 uF ( L and R ) for output capacitor at 1000uF with voltage 50 V or higher.

This is a continuation of previous demo SAP PI/PO : –  POSDM INTEGRATION WITH ARTS POSLog POS SYSTEM – TUTORIAL 1 . In the previous demo I have shown how to integrated POS Sales with POSDM BAPI. Before proceeding to this demo request to go through the above demo published in link: SAP PI/PO  : –  POSDM INTEGRATION WITH ARTS POSLog POS SYSTEM – TUTORIAL 1 In this demo I would like to show  how to integrate an Inbound ARTS POSLog Sales with POSDM IDOC  through SAP PI/PO In any IS Retail implementation , Sales from Point Of Sales(POS) system needs to be integrated with SAP ERP. Process flow is as below:           POS(Sales) -> SAP PI/PO -> POSDM(SAP BW) -> SAP ECC. Step1 :  Import the IDOC "/POSDW/POSTR_CREATEMULTIPLE./POSDW/POSTR_CREATEMULTIPLE04" from BW  system. Step2 : Create a Source Data Type. Step3 : Create a Message Type: Step 4: Create  outbound service interface Step6 : Create Operation Mapping as shown below : In the operation map 3 steps ar...