electronics-amplifier tutorial

Based amplifier IC's offer many advantages including high efficiency, high gain, low standby current, low component count, small size and, of course, low cost. It is little wonder that audio amp IC's have replaced most discrete transistors in consumer electronic devices. While many experimenters have stayed away from these little black Mysteries, I am going to uncover some of their secrets and demonstrate how easy they are to use

Skema Rangkaian Amplifier IC LM380-8

Skema Rangkaian Amplifier IC LM380

Rangkaian Amplifier V-Mosfet 100 Watt

Another design that uses the output transistor technology V-MOSFET. The transistors are we offer many advantages over a simple bipolar transistor, such as high speed, thermal stability, low distortion, etc.

Skema Rangkaian Amplifier V-Mosfet 100 Watt

The use of diodes D2 until D5 in combination with the resistances R17-19, they protect the gates of transistors v-fet from exceeds the voltage ± 14V and it creates perforation in very thin layer SiO2, that is used as insulation in the gate. This way of protection is common in all the amplifiers that use these transistors. The total gain of amplifier is 32.6, regulated from the R18, R6 and R8, in the negative feedback. Also is used enough the use of local feedback for stabilisation of operation under all the conditions. Because the transistors v-fet have positive factor of temperature, with result with the increase of temperature is increased also their resistance. This increase has as result the reduction of current that via the transistor, hence also his power. The use of separated supply in the stages of drive and exit, ensures stability and reject of distortion of intermodulation.

Series of VMOS FET POWER [ 2SK134 or 2SK135 ] [ 2SJ49 or 2SJ50 ], they are that, more above transistor they are not produced more by the Toshiba and are enough difficult they are found henceforth. They can be replaced with [ 2SK1530 in the place of 2SK135 ] and [ 2SJ201 in the place of 2SJ50 ]. The new transistors are in plastic case ΤΟ-3Ρ and no TO-3, bear in bigger supply of operation and have positive factor of temperature. This mean that with the increase of temperature, is increased and the current that is gone through from through the transistor. The new transistors him I have still not tryed and me it would interest to learn if somebody him used also with which results.

Rangkaian Amplifier Mono 25Watt

Skema Rangkaian TDA7482 Mono Amplifier 25Watt

• 25 W rated output power. Working conditions are: RL = 4 ~ 8 Ω, THD ≤ 10%. In fact, in accordance with the recommendation of the parameters, when RL = 8 Ω, P out = 1 W at its THD is only 0.1 percent.
• has a high output efficiency. When Vcc = ± 21V, RL = 8 Ω, P out = 18 W, the efficiency of 78 percent, so only a small work of the radiator, or even do not have to be.
• wide operating voltage range. Recommended for ± 10V ~ ± 25V, a car battery for power supply.
• are equipped with overcurrent protection devices, when RL = 0 Ω at the threshold for action to protect 3.5 A ~ 5A.
• are equipped with over-voltage protection devices, the threshold for the protection of 50 V.
• overheated overload, overheated temperature close to 150 ℃.
• ST-BY and MUTE functions.
• recommended the carrier frequency PWM operating frequency is 100 kHz ~ 200kHz.
• input noise (20 Hz ~ 20kHz) for 7 μ F ~ 12 μ F.
• input impedance for the 30 k Ω.

• DC Supply Voltage ±28 V
• Power Dissipation Tcase = 70°C 35 W
• Tj Storage and Junction Temperature –40 to 150 °C
• Maximum Voltage Across RF (pin6) 8 V
• Operating Temperature Range 0 to 70 °C
• Max ESD on Pins ±1.2 KV

Skema Rangkaian 170Watt Amplifier BTL LM4651 & LM4652

IC LM4651 is a integrated conventional pulse width modulator driver IC. The IC contains short circuit, under voltage, over modulation, and thermal shut down protection circuitry. The LM4651 also contains a standby function which shuts down the pulse width modulation minimizing supply current.

IC LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. The LM4652 has a temperature sensor built in to alert the LM4651 when the die temperature of the LM4652 exceeds the threshold. Together, these two IC's form a simple, compact high power audio amplifier solution complete with protection normally seen only in Class AB amplifiers. Few external components and minimal traces between the IC's keep the PCB area small and aids in EMI control.

• Supply Voltage ± 22V
• Output Current (LM4652) 10A
• Power Dissipation (LM4651) 1.5W
• Power Dissipation (LM4652) 32W
• ESD Susceptibility (LM4651) 2000V,
• ESD Susceptibility LM4652 (pins 2,6,10,11) 500V
• ESD Susceptibility (LM4651) (Note 5) 200V
• ESD Susceptibility LM4652 (pins 2,6,10,11) 100V
• Junction Temperature 150°C
• Soldering Information N, TA and TF Package (10 seconds) 260°C
• Storage Temperature −40°C to + 150°C