Circuit 8Ω Speaker with 100w rms 4Ω speaker and 200w rms power supply voltage 2x32V 2x40V used mosfets 4x IRF540 4x IRFP360 MOSFET transistor 100Wrms 8 ohm or 200Wrms 4 ohm amplifier. This amp was published in Elektor. I rearranged the diagram and made the drawing to adapt the MOS transistors to the TOP3 or TO220 package.
The advantage of this amplifier is that it uses only N-channel MOS transistors for power. It is also thermal and short-circuit protected. It is possible to increase the power by increasing the number of power MOS transistors.
The circuit is designed to use BC546/556 type transistors. You can also mount the 2N5551/5401. It is not possible to put BC547/8/9… as their voltage is too low.
The on-board installation is planned for the BC546/556: if you want to assemble the 2N5551/5401 you will need to fold them upside down (CBE instead of EBC).
Same for the BF870, which can be replaced with an upside-down BDX78.
We can use almost any type of MOS transistor for power (IRF, IRFP, ICE …). The power supply will consist of a 2x32V to 2x40V 250VA transformer followed by a 15A / 100V diode bridge and 2 capacitors of 22000uF / 63V.
The adjustments to be made are the quiescent current and the tripping of the thermal protection. Connect a speaker or 4/8 ohm load for testing.
Static current: this is set by R51 by connecting a GBF with a sinusoidal signal (low amplitude) and looking at the shape of the sinusoidal oscillator (it should not be distorted). If you don’t have an oscilloscope, you can connect a sound source at very low volume and listen for the distortion by ear, or connect a voltmeter to R46 and get about 0.6V (ie R46*Ur46 = 100*0.6 = 6mA ).
Thermal protection: Bring a soldering iron to the CTN R53 and set the R50 to mute.
Note: There is no MUTE in this amplifier, but it can be done by shorting R53. We can also combine this assembly with protection against DC voltages and delayed operation in the loudspeaker.
Source: http://sjeffroy.free.fr RMS 100W Mosfet Amplifier Circuit alternative link:
Password: 320volt.com
Published: 2008/05/18 Tags: audio amplifier circuits, transistor amplifier
89C51 8051 voltmeter thermometer DS1621 ADC0808
ADC 0808 standard data acquisition systems many components on a single chip host is a member of ADC 0808 8-bit flip makes the process and addresses from input latch 8-channel data selection (multiplexer) and microprocessor compatible with the associated control logic provides.
ADC 0808 standard data acquisition systems many components on a single chip host is a member of ADC 0808 8-bit flip makes the process and addresses from input latch 8-channel data selection (multiplexer) and microprocessor compatible with the associated control logic provides.