An amplifier to go with an antique Meissner AM High Fidelity tuner that I had restored. But by the time the amp was finished it sounded so good that it has become my amp of choice for listening to CDs while working in the shop. The only parts purchased new were the resistors, capacitors and an aluminum chassis from Hammond. I made use of parts that had accumulated
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from parted out chassis and Ebay auctions. I estimate that there is around $50. 00 total invested with about a week of building, rebuilding, tweaking and experimentation. The output transformer is from a Hammond church organ chassis from Ebay that also netted two 6L6 tubes, two 6SL7s and a couple of 6SN7s. I got the 5V4 from Ebay for $6. 00. The power transformer also came from a lucky Ebay win in which I got two transformers for $10. 00. The signal from one or both input jacks is combined with a resistor network consisting of two 100K resistors and a 50K gain control pot. The signal is amplified by the 6SL7 twin high mu triode connected with elements in parallel for low noise and to provide a feedback point for the global feedback. The stage has very little gain due to there being no bypass capacitor around the cathode resistor, global feedback and local feedback through the 470K resistor from the plate of the input triode of the Schmidt phase inverter. The output is passed to the grid of triode one of the Schmidt phase inverter by a. 005 uF capacitor. I found that any larger coupling capacitor here produced distortion by a phenomenon known as `blocking`. The 50K resistor to ground in the cathode of the phase inverter is large enough to provide a `constant current` source and allows the plate resistors to be the same value. Any value larger than 50K raises the cathode voltage above the heater-cathode rating of the 6SL7....
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.....
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