Showing posts with label x. Show all posts
Showing posts with label x. Show all posts
Monday, October 27, 2014
LM4765 2 x 30 watt amplifier Diagram Circuit
A very simple 2 x 30 watt amplifier electronic circuit project can be designed using the LM4765 stereo audio amplifier IC capable of delivering typically 30W per channel of continuous average output power into an 8Ω load with less than 0.1% THD+N.
This 2 x 30 watt amplifier electronic circuit is very simple and require few external electronic parts and can be used in high end stereo TVs or some other audio applications .
Each amplifier has an independent smooth transition fadein/out mute and a power conserving standby mode which can be controlled by external logic.
Like many other audio amplifier ICs the LM4765 has many features like Temperature protection circuitry, SPiKe protection ( means that these parts are safeguarded at the output against overvoltage, undervoltage, overloads, including thermal runaway and instantaneous temperature peaks).
This audio amplifier electronic circuit project can be powered from a wide input voltage range from 20 volt up to 66 volts , but typically is required a dual 28 volts input ( take care because |Vcc|+|Vee|<60 volts .
The audio IC must be mounted on a heat sink to keep the die temperature at a level such that the thermal protection circuitry does not operate under normal circumstances.
In this circuit diagram is represented just a part of the IC (one channel ) and numbers in parentheses represent pinout for amplifier B
Thursday, September 18, 2014
Sunday, September 7, 2014
4 x 50W quad power amplifier TDA7564B
Features:
■ Multipower BCD technology
■ MOSFET output power stage
■ DMOS power output
■ New high efficiency (class SB)
■ High output power capability 4x28 W/4 @
14.4 V, 1 kHz, 10 % THD, 4x50 W max, power
■ Max. output power 4x72 W/2
■ Full I2C bus driving:
– Standby
– Independent front/rear soft play/mute
– Selectable gain (for low noise line output
function)
– High efficiency enable/disable
– I2C bus digital diagnostics (including AC
and DC load detection)
■ Full fault protection
■ DC offset detection
■ Four independent short circuit protection
■ Clipping detector (2 %/10 %)
■ Linear thermal shutdown with multiple thermal
warning
■ ESD protection
Description:
The TDA7564B is a new BCD technology quad bridge type of car radio amplifier in Flexiwatt25 / PowerSO36 package specially intended for car radio applications. Thanks to the DMOS output stage the TDA7564B has a very low distortion allowing a clear powerful sound. Among the features, its superior efficiency performance coming from the internal exclusive structure, makes it the most suitable device to simplify the thermal management in high power sets. The dissipated output power under average listening condition is in fact reduced up to 50% when compared to the level provided by conventional class AB solutions. This device is equipped with a full diagnostics array that communicates the status of each speaker through the I2C bus.
Circuit Diagram:
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| 4 x 50W quad power amplifier TDA7564B |
Tuesday, August 26, 2014
TDA7384 4 x 22W car power amplifier
TDA7384 - 4 x 22W car power amplifier
I didn’t find much information about this chip on the internet so I decided to built it and try on my own. As datasheets of TDA7384 says it is low distortion, low output noise, low external component count. Also has Stand-By function and Mute function. It has several protections like from output short circuit to GND or to Vs, capable to handle very inductive loads, thermal limiter, load dump voltage. TDA7384 is an AB power amplifier cased in flexiwatt25 (eagle library is included in project archive) package wich is designed for high end car radio applications. It allows rail to rail output voltage swing with no need of boot-strap capacitors.
| Schematics TDA7384 |
I have followed the schematic in datasheed when building circuit. In datasheet you may also find PCB layout but it is two layered and didn’t fit to may box I’ve chosen. So I have made single sided PCB 50X100mm.
| PCB TDA7384 amplifier |
As I put pins on PCB for ST-BY and Mute but I not using them, I connected these pins to VCC like it is shown in PCB view. According to datasheet St-By and Mute turns off amplifier if signal in input is lower than 3.5V. So it is recommended to connect these pins to Vcc if not used.
Maximum power dissipation of chip is 80W(Tcase=70ºC), so it can handle 4 channels working at power of 20W each. But of course chip in a box doesn’t have good ventilation so I’ve put a radiator to ensure that amplifier effectively dissipates heats. I didn’t try to load amplifier to maximum to se if it doesn’t heat up to much. But at normal sound level it stays warm what is normal.
| On box amplifier |
Dont forget to put thermal paste between chip and radiator to ensure lower thermal resistance. And here we go – brand new power amplifier ready to go:
| Already to use |
source: [link]
Saturday, August 9, 2014
Power Supply Switched 15V x 6A Wiring diagram Schematic
This schema is a switching power source, or SMPS, it is based on the MC33374 integrated schema, which is a switching voltage regulator high power manufactured by Motorola Semiconductor. This switching power supply schema using the MC33374 will provide a maximum power of around 90 W and requires few external components.
Power Supply Switched 15V x 6A Circuit Diagram
The MC33374 is an IC designed to operate directly from a rectified supply line, with a fixed input AC 100 V, 115 V or 230 V, and more than 90 W with a variable AC input varies from 85 V to 265 V.
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