This is the circuit diagram for low noise stereo preamplifier based on NE5533 operational amplifier. The circuit uses 2 pieces of NE5533 since there is only 2 op-amp circuits inside NE5533. This circuit is featured volume level, right/left balancing and loudness level adjustment. It will be easy to build this circuit since the components used in this circuit is not much and easy to find at electronic store. About NE5533: The NE5533 is dual/stereo high-performance low noise operational amplifiers . Compared to other operational amplifiers, such as TL083, they show better noise performance, improved output drive capability and considerably higher small-signal and power bandwidths. The single op-amp version is NE5534. This makes the devices especially suitable for application in high quality and professional audio equipment, in instrumentation and control circuits and telephone channel amplifiers. The op amps are internally compensated for gain equal to, or higher than, three. The freque...

Here the 22W audio amplifier which is low cost and very easy to build. You can use this circuit as a booster in a car audio system, an amplifier for satellite speakers in a surround sound or home theater system, or as an amplifier for computer speakers Circuit Notes Use 4 ohm speakers for best performance, but 8 ohm units can be used too. The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The TDA1554 chip should keep cool enough to touch with the proper heatsink installed. The circuit works at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat on the TDA1554 chip. Construction on Printed circuit board (PCB) is preferred, but universal solder or perf board will do since the design is very simple. Keep lead length short. Parts List: R1 = 39K C1,C2 = 10uf/25V C3 = 100uf/25V C4 = 47uf/25V C5 = 100nF C6 = 2200uf/25V U1 = TDA1554

In the circuit diagram shown, BA5406 is configures to deliver 5×2 watts into 4 ohm loudspeakers at a supply offer voltage of 9 volts. Capacitor C3 is a power supply filter capacitor. C11 and C12 are input DC decoupling capacitors for the left and right channels. C3 and R2 forms a Zobel network for the left output whereas C6 & R3 forms identical for the correct channel. Purpose of the Zobel network is to cut back oscillations and improve high frequency stability of the amplifier. Potentiometers R5 and R6 serves as the quantity control for the left and right channels. CapacitorsC4 and C8 couple the outputs of the amplifier to the speakers. C9 and C10 are noise filtering capacitors. C1 and C5 are bootstrap capacitors for the left and right channels.

When troubleshooting the 12v electrical system of an automobile, it's nice to possess an easy voltage indicator tool rather than a voltmeter. This electronic circuit, is powered by 2 AA or perhaps 2 N cells, which can offer enough energy for years of service. The circuit has solely two leads. One lead connects to the chassis ground of the automotive. The second lead will be sharp tip probe. The circuit can indicate if an automotive electrical circuit has zero volts or 12 volts present. If the voltage is close to +12v, a inexperienced LED will activate. If the voltage is close to chassis ground a red LED will activate. If the circuit is open, neither light will light. The circuit attracts so few current in the open standby mode that no on/off switch is needed.