This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally used as an overdrive effect. This design started out as an idea for a booster pedal circuit u
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sing low-noise JFETs following the principles of the Fetzer Valve(see ). I wanted plenty of headroom and however many stages I would need to have enough gain for clipping. I did not want clipping, but I wanted all the gain I could have up to the point of clipping. The output levels from different guitar pickups vary, so I figured a preamp that could reach the limits imposed by the supply voltage using the guitars I have could provide enough clean gain for most guitars. Using an 18 V supply allows for more clean gain than one can get with any 9 V circuit. Of course, that also means the output voltage might be higher than can be safely used with some solid state amplifiers and pedals. This design can easily be scaled to a 9 V supply, but might require more stages or higher gain JFETs that might be noisier than the 2n5457. I decided to used Fetzer valve based stages due to the supposed tube like performance of the Fetzer Valve design. I am not sure how well the Fetzer valve emulates a triode stage, but I think JFETs generally do a good job in preamp designs. I like the sound clips on the runoffgroove. com site, and I like the triode-to-jfet conversion designs I`ve heard elsewhere. For example, I think the Dr. Boogie preamp I built (based on the schematic from gaussmarkov. net) absolutely kicks ass. One may argue that the Fetzer design might not be the best for a clean preamp/boost circuit. By omitting the source resistor...
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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