Feb 11th, 2009
by Electronics Online.
Circuit Description:
This amplifier uses a dual 20 Volt power supply and delivers 15 watts RMS into an 8 ohm load. Q1 operates in common emitter, the input signal being passed to the bias chain consisting of Q8, Q9, D6, D13 and D14. Q8 and Q9 provide a constant current through the bias chain to minimize distortion, the output stage formed by a discrete darlington pair (Q2,Q4) and (Q7,Q11). The last two transistors are power transitors, specifically the 2N3055 and MJ2955. The 7.02K resistor, R16 was made using a series combination of a 4.7K, 680 Ohms, and two 820 Ohms. The 1.1K resistor, R3 was made using a 100 Ohms and a 1K resistor. You can use this circuit with any walkman or CD player since it is designed to take a standard 500mv RMS signal.
Feb 11th, 2009
by Electronics Online.
Here the Class A Amplifier with below specification:
- 24W Class A into 8 Ohm
- 100mHz – 100kHz flat
- 305mV input for 24W into 8 Ohm (33dB gain)
- THD is very low, although I have not been able to measure it properly
The supply voltage can be between 34V and 46V and the quiescent current should be set to 1.7A measured through R25 (a voltage of 0.75V must be measured over R25 for a quiescent current of just under 1.7A).
Dec 11th, 2008
by Electronics Online.
This schematic is very simple, there is just need 1 active component in each channel (I mean right channel and left channel). So, there are 2 active components for stereo a stereo audio power amplifier.
The schematic originally come from www.circuit-projects.com
Description:
Dec 2nd, 2008
by Electronics Online.
Power supply is a must used circuits. Most of electronic devices which require DC voltage usually need a power supply. Some of them just need original power supply or battery, but some of circuits like Radio transmitter or amplifier needs high current output power supply.
This project is a simple and easy made 5 ampere power supply. To build this circuit, just follow the instruction below:
