The amp has been designed to be an ideal upgrade for builders wishing to step up from Gainclones. This amp will kick out the power where Gainclones fall over, yet still maintain a sweet sound. The use of n-channel MOSFETs in the output makes the amp easy to source parts for as well as being very rugged. Provided that high power MOSFETs such as the
Click here to download the full size of the above Circuit.
specified IRFP250 are used and the appropriate fuses are used on the board, the amp should shrug off short circuits at the output. With the recommended supply voltage of 41 V per rail (30 V transformer secondaries), 160 W RMS into 4 ohms is achievable, again if the recommended IRFP250 devices are used. The use of less powerful MOSFETs will mean you need to use higher load impedances and/or reduce the rail voltage. A differential pair is used at the input, which features a constant-current source in the tail and resistor loading. There are tracks and pads on the PCB to implement a current mirror for future upgrades. The voltage amplifier stage (VAS) uses a bootstrap capacitor to act as a current source, primarily to allow the drive to the upper output device to swing above the positive supply rail to increase efficiency. The lower output device is run as a Sziklai pair so has quite good efficiency too. The bias generator (T6, R11, P1, R12) is configured so that if the potentiometer goes open circuit, bias current will fall to a small amount. The Zener diodes on the MOSFETs are to protect them from over-voltage which can `punch through` the gate destroying the device. The corresponding diodes in series with them prevent any back EMF from the load turning the MOSFET on. Do not apply any power to the amplifier until the bias transistor and output devices have been mounted to the heatsink. Failure to do this will most likely...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: