This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because I needed a 25 Watt PC amp and did not want to sp
Click here to download the full size of the above Circuit.
end any money. So I designed around parts I had in the shop. R1 = 47K R2 = 4K7 R3 = 1K5 R4 = 47K R5 = 390R R6 = 470R R7 = 33K R8 = 150K R9 = 15K R10 = 27R R11 = 500R-1/2W R12 = 10R R13 = 10R R14 = 220R R15 = 220R R16 = 10R R17 = 8. 2R-2W R18 = 22R-4W(wirewound) C1 = 470nF-63V C2 = 330pF-63V C3 = 470 µF-63V C4 = 100nF-63V C5 = 470 µF-63V C6 = 100nF-63V C7 = 100 µF-25V C8 = 100nF-63V C9 = 10pF-63V C10 = 1 µF-63V C11 = 100nF-63V Q1 = BC560C Q2 = BC560C Q3 = BC560C Q4 = BC560C Q5 = BC560C Q6 = BD140 Q7 = BD139 Q8 = IRF530 Q9 = IRF9530 R1 = 3K3-1/2W C1 = 10nF-1000V C2 = 4700 µF-50V C3 = 4700 µF-50V C4 = 100nF-63V C5 = 100nF-63V D1 = 200V 8A Diode bridge D2 = 5mm. Red LED F2 = 3. 15A Fuses with sockets F2 = 3. 15A Fuses with sockets T1 = 220V Primary, 25 + 25V Secondary 120VA Mains transformer PL1 = Male Mains plug SW1 = SPST Mains switch * Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. * Q6 & Q7 must have a small U-shaped heatsink. * Q8 & Q9 must be mounted on heatsink. * Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter connected in series to Q8 Drain) with no input signal. * A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 to output ground. Then connect separately...
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: