The Echorec delay is a superb piece of engineering! In their quest for perfection Binson got many important aspects of the design right, maintaining a balance between simplicity and adding genuinely useful features to this classic echo machine. The engineers developed their own unique magnetic drum storage medium that offered superior reliability
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(permanent guarantee`) and stability over 1/4 ³ tape used in all other tape echo units. No expense was spared in the design of the mixing and amplifier circuitry there are seven miniature B9A tubes inside the unit. All the tubes are still readily available 12AX7 and 12AU7 triodes. The level indicator is an EM81 tube which are also now being manufactured. This webpage contains a description of each functional part of the circuit, a flowchart clearly showing the signal flow, schematics for the Echorec IA and II. The input buffer is an inverting gain stage based on section 4A of a 12AX7 tube. To optimize this to work with electric guitar pickups the the 47K resistor before the input coupling capacitor can be removed. Virtually all guitar amp input stages are direct coupled i. e. there is no capacitor. This is okay as a guitar pickup only generates an AC component with no DC offsets. Note: there is no cathode bias resistor. Typically triode amplifier configurations have a 1K8 resistor to maintain the grid voltage below the cathode. Mixer stage with common anode resistor. This is where the dry` signal and delayed signal are mixed to create multiple repeats. Trimmer, T2 is used to set the range of the LENGTH OF SWELL` knob. The record amplifier is based on tube section 6A which provides some amplification. Additionally passive 1st order filtering before the grid provide -6dB/octave roll-off of low and high frequencies. The bias...
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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