Thursday, July 28, 2011
IRF44 Mosfet based on 100 Watt Inverter Circuit
This inverter circuit can offer a really stable 230V Output Voltage. Frequency of operation is decided by a VR1 and is generally set to 60 Hz. varied “off the shelf” transformers can be used. Or Custom wind your own for best results. additional MosFets can be paralleled for higher power. it's recommended to own a “Fuse” within the Power Line and to perpetually have a “Load connected”, while power is being applied. The Fuse ought to be10 Amps per one hundred watts of output. the ability leads must be serious enough wire to handle this High Current Draw.

Absolute Maximum Ratings of IRF44 Mosfet
- Continuous Drain Current (25°C, 10V) = 49 A
- Continuous Drain Current ( 100°C, 10V) = 35 A
- Pulsed Drain Current = 160 A
- Power Dissipation = 94 W
- Gate-to-Source Voltage = ± 20 V
- Avalanche Current = 25 A
- Operating Junction = -55 to + 175
Monday, July 25, 2011
LM3875-High Audio Amplifier 56W

The LM3875 is an audio amplifier for high power output capable of delivering 56W of continuous average power to a load 8. The performance of the LM3875, utilizing its maximum instantaneous auto temperature (° Ke) (Spike ™) protection circuitry, places it in a class above discrete and hybrid amplifiers by providing a yes, dynamically protected area of safe operation (SOA). SPIKE protection means that these parts are fully protected against output overvoltage, voltage surges caused by shorts to the supplies, the peak temperature thermal runaway, and instantaneous.
This amplifier circuit is based on the non-inverted GainClone standard configuration. I did some calucaltions the feedback resistor and other components in order to check the gain, etc. For more background on the calculations relevant to GainClones in the background section.
Parameters IC LM3875Output Current 6000 mA.
Offset Voltage max, 25C 10 mV.
Gain Bandwidth 8 MHz.
Supply Min 20 Volt.
Supply Max 84 Volt.
Supply Current Per Channel 30 mA.
PowerWise Rating 2 3750 uA/MHz.
Slew Rate 11 Volts/usec.
Input OutputType Not Rail to Rail.
Max Input Bias Current 1000 nA.
Special Features AvCl>10.
Function Op Amp.
Channels 1 Channels.
Temperature Min 0 deg C.
Temperature Max 70 deg C.
Friday, July 22, 2011
12 watt FM Transmitter circuit
The advantages of FM modulation is free from the influence of the disturbance of air, bandwidth (broadband) is larger, and the high fidelitas. Compared to the AM system.
FM transmitter is a modification of the FM transmitter on the market (s Saturn type 038). several series of modifications and additions can produce energy Boster number to about 12 watts.
of the series after this work is quite good, the signal generated is stable and strong enough
time in no hurry to do it directly, but usually do each part in sequence so that the error may be earlier
the first part of the work is in the oscillator, after the raft can try to turn radio waves in free mode and set the radio volume so clearly audible hiss. turn the core Koker whistle on the radio is, if you get a signal in a robust and stable set of oscillator has been working with both.
the next section can start at the raft, after the end of the second set trimer (C8 and C11) in the buffer, in turn can feed even the largest steel cables and the older children. If the series works well, there are approximately 0.25 watts
for more resources that can be added over the wider range Boster 12 watts, so the distance will be increased to up to seven times.
FM transmitter is a modification of the FM transmitter on the market (s Saturn type 038). several series of modifications and additions can produce energy Boster number to about 12 watts.
of the series after this work is quite good, the signal generated is stable and strong enough
time in no hurry to do it directly, but usually do each part in sequence so that the error may be earlier
the first part of the work is in the oscillator, after the raft can try to turn radio waves in free mode and set the radio volume so clearly audible hiss. turn the core Koker whistle on the radio is, if you get a signal in a robust and stable set of oscillator has been working with both.
the next section can start at the raft, after the end of the second set trimer (C8 and C11) in the buffer, in turn can feed even the largest steel cables and the older children. If the series works well, there are approximately 0.25 watts
for more resources that can be added over the wider range Boster 12 watts, so the distance will be increased to up to seven times.
Wednesday, July 20, 2011
Audio Amplifier Using IC LM4780
Explore power amplifier integrated circuit from National Semiconductor LM4780. What's so special? Well, first of all - a very low harmonic distortion. In general, manufacturers indicate the maximum power of his ingenious craft regularly with the harmonic content of 10%. At the same chip, CT in the specified maximum power is only 0.5%! Therefore, it is the most honest of all mikruha've found.
The chip implements two identical amplifier channels and features are given for the stereo amplifier. Circuit can also operate in mono - the inclusion of the bridge. In this case, the power output at CT = 0.5% of 120 watts. Other features remain virtually unchanged.
LM4780 IC Fiture
- Features SPiKe Protection
- Low external component count
- Quiet fade-in/out mute mode
- Wide supply range: 20V - 84V
- Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W)


Sunday, July 17, 2011
LM2678-5.0 on 5Volt Switching Regulator


This is the circuit diagram of a 5V power regulator based on LM2678 IC. The LM2678 series of regulators are monolithic integrated circuits that provide all the necessary functions required for a switching regulator money and can handle loads up to 5A. The IC has more than 90% efficiency and has to load and line regulation. The LM2678 is available in three fixed output voltages (3.3 V, 5V, 12V) and an adjustable output version. The IC is also filled with a bunch of l features such as thermal shutdown, current limiting and power on / off.
Note:
- The circuit given here is based on the version LM2678-5.0 which gives an output of 5V.
- The power supply for the circuit can be anything between 8 to 40V DC.
- The feedback wiring must be placed as away as possible from the inductor L1.
- Do not use loads that consume more than 5A.
- A heat sink is seriously recommended for the IC.
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