I began tracing the BASH amplifier circuit for my V. 2-400. The following schematics are my best effort to document what I found. I have also described design defects I have found and what I am doing to improve them. Evan Shultz spent an amazing amount of time tracing the circuits for his ProMedia V4. 1 and V2. 1. This tracing included removing some components to check their value and replacing them.
Click here to download the full size of the above Circuit.
If you think this is not an amazing amout of work, you have never tried it. After generating schematics of the ProMedia V4. 1 and V2. 1, Evan moved on to the ProMedia V5. 1. Miguel Mejia provided a V5. 1, and Evan bought another V5. 1 off E-bay. So now we have the complete Promedia line from V2. 1 to V5. 1, giving you the customer support that Klipsch would never provide. The BASH amplifier is not as complicated as it first appears. AC power of 117 volts is rectified to 156Vdc on the Input-Output board, and then goes to to the DC-to-DC converter. The converter drops the 156Vdc to +/- 30 Vdc that goes to LM340 and LM320 discrete IC regulators on the Input-Output board. From these regulators, the audio IC preamplifier stages get powered up. The converter also supplies a fixed 60-Vdc to what Indigo calls a Digital Converter. The Digital Converter is the heart of the BASH amplifier. Voltage to the power amplifiers is kept just a few volts above the amplifier`s output swing voltage by an audio processor hybrid pulse-width modulating a buck step-down converter. A buck step-down converter operates by applying short pulses of high voltage to an inductor in series with its output load. These pulses flow through the inductor, which builds a magnetic field. The collapse of the magnetic field between pulses keeps the current flowing at a constant rate into its load and back to the inductor through a diode. The voltage across the buck...
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: