Tuesday, July 31, 2012

Stereo Chorus

Semiconductor parts :
  • IC1,IC2: 6458D or TA75558P (Dual operational amplifier)
  • IC3: LA6358 or TA75358P (Dual operational amplifier)
  • IC4: MN3207 (1024 stage BBD)
  • IC5: MN3102 (BBD driver)
  • IC6: D4027BC or TC4027BAP (Dual J-K Master/Slave Flip-Flop)
  • Q1-Q3,Q5,Q7-Q9: 2SC1815 or equivalents (NPN silicon transistors)
  • Q4,Q6,Q9: 2SK772, 2SK445 or equivalents (N-Channel JFET)
  • D1-D6: 1N4148 or equivalents (switching diodes)
  • ZD1: 5.1V Zener diode

Sunday, July 29, 2012

Bridge 100 W Amplifier

The center of this link operate firm routine is the TDA7294 incorporated routine which is actually a energy functional firm with a pre-amplifier routine, heat range management and outcome brief routine security. Moreover the IC is outfitted with individual reviews Mime (Mute output) and the STBY or Stand-By (Disconnect the energy amplifier). Each IC increases half-cycle indication reviews and provides outcome 50W each.

This 100W link firm routine must be operated with + /-25V and 4A. Where to stereo program devices demanding present should be 8A. Fill (speaker) must be 8 ohms. With these values​​, the routine will provide 100W with a complete frame distortions of less than 0.1% frame distortions or 150W with a complete of about 10%. Because of this reviews to the presenter settings to link the two devices (positive and negative), the adverse terminal should not be relocated to the floor as in other amps. Doing so will cause a brief routine at the outcome of the processor and harm it by initiating safety if not changed soon enough.

For energy can be use traditional transformer or a changing energy, in the latter situation the resource must be of top excellent and strained. But if bodyweight is not a issue we suggest using a excellent old transformer with rectifier and electrolytic and clay capacitors.

The producer of this IC (SGS-Thompson) should stimulate the mute operate before using Stand-By. This IC produces 1.3 levels Celsius per w of energy. That is why we have to put on an sufficient warm mess up to avoid program get too hot and cause overtemperature shut down.

Although the maker statements that this is a built-in 100v / 100w should be recalled that this requirements is officially and in theory. In exercise, the incorporated routine can provide energy over a 50w 8 ohm load at a present of 50V for beginning which uses about 2 amperes and produces warm.

Saturday, July 28, 2012

Feed Back Power Amplifier

This concept has showed up lengthy returning in Realistic Gadgets a UK centered Journal. Based on this concept I designed this routine during 1981 to 1986 with lots of field tests and variations, the style was freezing in 1986. I have constructed so many amps for me and for my friends centered on this style with various energy levels. They are still throwing in so many homes. This concept can be used to any current firm also. You must pay attention to believe the superior booming bass sounds reaction. superior mid and hi wavelengths. Excellent temporary reaction with very low frame distortions. Hope you people  will enjoy the duplication of this firm.

In the art of audio sound duplication it is well-known that the powerful presenter is more nonlinear and produces more frame distortions than all the other program elements mixed. This is particularly true at low wavelengths which need large spool adventures where the rigidity of both the inner examine and the external encompass improves quickly as the spool techniques its optimum displacement, leading to a nonlinear revocation conformity producing great frame distortions.
For example, in a common great constancy stereo audio at a consistency of about 35 Hz the complete harmonic frame distortions of the firm might be of the order of 0.01%, whereas the frame distortions of the presenter might range from about 3.0% to about 50.0%, based on the volume. If this spool movement can be thought and given as a nourish returning to the previously level of the firm, this frame distortions can be reduced considerably.

Motional Reviews (MFB) was a audio speakers developed in the early Seventies by Philips Netherlands. It presented a feedback program to the woofers of HiFi audio speakers, allowing them to achieve a more prolonged low consistency reaction in a relatively small fencing. The key benefits are a very managed bass sounds reaction. Any frame distortions caused by the fencing or the woofer itself is instantly repaired by the feedback. These hand-built audio speakers were appearing excellent and were quite expensive.

As a different strategy, instead of using the spool activity, the present circulation through the speech can be thought (the present is proportionate to spool movement) and can be used as a spool activity feedback. This novel concept is used in this firm style (I don’t declare any originality; this concept has showed up in Realistic Gadgets UK Journal – lengthy returning – They might have even trademarked it).

The firm used here is a traditional Philips audio program routine, with a requirements of 40 W RMS @ < 0.06% Total Harmonic Distortion into 8 ohms impedance presenter and having a consistency reaction from 20Hz to 100 KHz, appropriately improved for our program.

The firm is a traditional category B immediately paired quasi free of charge out put level, managing with single 56Volt provide (no need for a managed or double energy supply). BC157 is the pre-driver and 50 percent provide backing. BD 139 is the car owner, a BD139 and a BD140 free of charge couple out put car owner level with 2N3055 as final out put level. The presenter speech coils present is thought through 0.47 ohms level of resistance linked from presenter one end to ground. This indication is given as negative fed returning to past level through 470 ohms. The 50 percent provide at presenter combining capacitor can be improved by different the 39K level of resistance (if required you may fix a 100K pre set in the place of 39K and modify for 50 percent provide with no in put indication at jct of both 0.47 ohms of out put transistors and presenter combining capacitor). The quiescent present through outcome transistors can be improved with 22 ohms in sequence with two prejudice diodes 1N4007. The value for 50mA quiescent present will lie between 15 to 33 ohms for a provide of 56volts. The firm can be secured with a simple 1.5Amp fast performing blend in the positive energy.

The firm can be constructed on 40watt Philips firm program panel or on any traditional simply immediately line panel. All the three car owner transistors need chilling segments. (Standard TO220 covering chilling fins). Out put transistors need a top quality extruded metal warm mess up with insulation increasing kit and with a apply of rubber conductive oil, permanently conductance of warm.

Saturday, July 14, 2012

35w Push Pull Amplifier

Power Take is designed using a tube company configurations and finally prepared push-pull. Pipe Power Firm 35W Power Take til uses EL-34 tube joints as the company end. In the power company is designed ​​with a tube at a look it looks simple because of the use of efficient components that are not complex. It should be described that the use of tube joints in this company needs a artist offer, and therefore in the process of developing and finishing have to be careful of artist and light. Particular series 35W Pipe Power Take Power Firm can be seen in the following figure out.

    Part List :

  * R1=470K 0,5W
  * R2-5= 2K2 0.5W
  * R3=150K 0.5W
  * R4= 220K 0.5W
  * R6-10= 56K 0.5W
  * R7=3.9K 0.5W
  * R8= 220R 0.5W
  * R9= 1M 0.5W
  * R11= 39K 1W
  * R12-23= 180K 0.5W
  * R13-21=820K 0.5W
  * R14-22=5K6 0.5W
  * R15-20= 680K 0.5W
  * R16-19=100K 0.5W
  * R17-18=3K3 1W
  * R24=470R 2W
  * TR1-2=470R 1W Variable (adj. 270Ω)
  * C1-3-6-7=0.1uf 630V
  * C2=220pF 600v
  * C4-5=16uF 550V
  * C8-9=0.1uF 630V
  * C10-14=0.47uF 630V
  * C11-13=25uF 40V
  * V1=E80CC
  * V2=E80CC
  * V3-4=EL34
  * Rectifier tube= Z2C
  * T1=Audio Transformer for 2x EL34 Push Pull

Friday, July 13, 2012

PCB and Schematic Design

ExpressPCB is a very easy to use Windows application for laying outprinted circuit boards.
While not required, we suggest that you draw a schematic for your circuit using the ExpressSCH program. By linking your schematic, ExpressPCB will guide you by highlighting the pins that should be connected together with traces.

Schematic design with expresspcb software

Pcb design with expresspcb software
You can download for this software at http://www.expresspcb.com or just click link bellow :

For ExpressPCB Tuturial You can download from links bellow :

Thursday, July 12, 2012

Portable Headphone Amplifier

Here I present a very simple and impressive headset company Schedule using NE5534/2 . Moreover to the IC NE5534/2, the routine uses only few non-active components and can easily generate a lot of sound from even the most worthless headphones and there will be no deal for the fantastic.

The 5534/2 is a low-distortion, low-noise program, having also the automobile capabilities low-impedance a lot to a finish present shift while maintaining low shape disturbances. Furthermore, it is absolutely result short-circuit proof. Therefore, this routine was used with just one 5532 brand creating a number of songs, inverting amplifiers, having an ac acquire of about 3.5 and able to provide up to 3.6V peak-to-peak into a 32 Ohm finish (corresponding to 50mW RMS) at less than 0.025% complete harmonic shape disturbances (1kHz & 10kHz).


Parts List :
P1 = 22K
R1 = 18K
R2 = 68K
R3 = 68K
R4 = 68K
R5 = 18K
R6 = 68K
C1 = 4.7uF/25v
C2 = 4.7uF/25v
C3 = 22pF
C4 = 220uF/25v
C5 = 220uF/25v
C6 = 4.7uF/25v
C7 = 22pF
C8 = 220uF/25v
J1 = 3.5mm Stereo Jack
B1 = 9V Alkaline Battery
IC1 = NE5532 or NE5534
SW1 = SPST Toggle Switch

Wednesday, July 4, 2012

LM4652 Class D Amplifier

The mixture of the LM4651 car owner IC and the LM4652 energy MOSFET Category D energy firm IC provides a top excellent firm remedy, appropriate for self-powered sound speakers, subs and excellent car enhancers. The LM 4651 is a completely incorporated traditional beat size modulator (PWM) car owner, containing undervoltage, short routine, overmodulation, and heat shut down security build. The IC features a stand by operate which ends down the beat size modulation, reducing provide current.

The LM 4652 is a completely incorporated H-bridge Power Mosfet IC in a TO220 energy program. The IC has a built in heat range indicator to aware the LM4651 when the die heat range surpasses the tolerance restrict. Used together, the LM4651 and LM4652 form a simple, lightweight, effective, top excellent energy sound firm remedy finish with security, normally seen only in Category AB amps.

The highest possible performance of this routine is 85% at 125W with a stand by attenuation greater than 100dB. The THD at 10W, 4 ohms, 10 - 500Hz is max. 0.3%. The provide current can not surpass ± 22V.

For the best performance a appropriate preamplifier is required. With the addition of a preamplifier the obtain of the energy level can be reduced to improve performance. The obtain should be set to 10 V/V enabling for low obtain on the Category D level with a total system obtain great enough to be a finish remedy for line level resources.

The feedback narrow used here does not clearly increase THD performance but will help to maintain a flat regularity reaction as the Q of the outcome narrow changes with fill impedance.

High Quality Head Pre-Amp

This routine reveals a dc-coupled, two-head music preamp using an LM1897. The routine features are: a GBW of 76 dB at 20 kHz, an S/N rate of 62 dB (CCIR/ARM), frame distortions 0.03% at 1kHz, power-supply denial higher than 95 dB, route separating of60 dB, and a common turn-on wait of 0.4 s.

Monday, July 2, 2012

40W HiFi Amplifier

Circuit Off 40 W Amplifier

Amplifier described here are intended for usage view ralatif output power requirements are. Output stage consists of two types of power transistors 2N3055, guarantees reliable components. At first glance it appears that Level of output is not symmetric because the T15 and T16 tansistor is of NPN type, but a second glance will show that in fact half the top NPN transistor consists of super T11, T13, T55, while the bottom half consists of super PNP transistors T12, T14, T16. 

Power Output is 40 watts at 8 Ohms or 60 watts at 4 Ohms with Distortion no more than 0.01% .Along the stride frequency of 20 Hz ... 20 KHz. Maximum power at the output signal from a severed is 45 watts at 8 Ohm and 4 Ohm 65watt on. Sensitivity put it is 800 (850) mVeff to 40 (45) watts at 8 Ohms and 700 (725) mVeff to 60 (65) watts at 4 Ohm. Karaktearistik frequency is in the 1 dB from 15 Hz to about 100 KHz. 
Due to the high current gain (not less than 200 000 x), then the output stage has a low quiescent current (though not critical) that is 25 ... 50 mA. Even with P1 set to minimum resistance of the spectrum analyzer is connected at opposite prototypes we showed that very small defects. Quiescent current is set by P1, with universal multi tester (stride-mV DC) is connected between the emitter and collector TI5 T16.So the flanking strands connected resistor R25 series ... R3O. A voltage of 33 mV occurs at 50 mA current, is provided by the PCB for this project, but it can be built using the PCB holes. It is advisable to arrange Lay out the components as possible congruent with the circuit diagram. Heat sink 1.5 ... 20 ° C / w is required for T15 and TI6, do not forget mikanya coatings ....

Power Supply

Scratch and Rumble Filter 2

The purpose of this filter is to undermine the very low frequency noise and very high. Because the cues in the stride frequency is generally large amounts of harm than good to the overall sound cues. Another consideration of this circuit is to mamandangnya sabagai pass filter is very wide path for the line that contains the most important part of the sound spectrum. The layout is so simple as it consists of two pieces of filter rows, a pass-over was followed by a pass down. Each filter comprises a pair of second-order filter stage stratified (cascade), to obtain the characteristics of a steep 24 dB / octave. Frequency of 11.8 Hz and the stopper is in 10.7 KHz with the components shown here. Adequacy of this point depends on the application and not too difficult to change it. Blockage of 11.8 Hz can be shifted up by reducing the value of the capacitor C1, ... C4, or can be facilitated by increasing its capacity.  This Capacitors  must all be of equal value. Pass filter frequency of the plugs can also be modified to change the value of resistor R5 .... R8. Like the capasitors, the fourth resistor should be worth it all together. This value can be reduced to increase the frequency of stoppers or enlarged to lower frequencies. Op-amp low noise dipergunaken merupaken type and there are two in each of the IC packaging. Therefore we need two ICs for each channel. Canals discharging currents around 20 mA each.