This is my DIY build of the Boozhound Laboratories JFET Phono Preampifier, but on a stripboard. The BHL preamp is based heavily on the Le Pacific RIAA phono preamplifier circuit shown below for reference. This is a strip board construction using brown polypropylene caps from the local electronics store. The large electrolytic capacitor is 10, 000u
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F fed by a 1 ohm resistor. Wire wrap wire is used as hook-up wire. Silver based solder, gold RCAs and all installed in an embossed gold chocolates box. Photographs 1 through 3. I`ve now built a number of these simple JFET phono preamplifiers. Photograph 4 below shows another of my DIY JFET RIAA Phono Preamp builds. The equalization circuit is also built on a stripboard and fit into a nice looking Hammond extruded aluminum chassis with a black anodized finish (Photograph 5). I also like to use Moving Coil (MC) cartridges with my turntable. MC cartridges have a much lower output compared to Moving Magnet (MM) cartridges. MC cartridges typically have an output of less than 1 mV, while the output level of MM cartridges is typically between 2. 5 and 7 mV. Therefore you will need some additional gain if you would like to use an MC cartridge with the Le Pacific Boozhound Labs phono preamp kit. The additional gain can be achieved by using passive phono step-up transformers or you can use an active circuit like the Le Pacific PrePre for MC Cartridges shown below in Figure 2. The Le Pacific MC PrePre circuit is placed immediately before your phono preamplifier. The MC preamp circuit is ultra simple to construct and like the Le Pacific can be easily built onto a protoboard. I`ve built a number of the LePacific MC PrePre circuits and have used them in front of both the Le Pacific preamp and the Boozhound Labs phono preamp kit. The...
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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