How to add an AC-3 RF output to older laser disc players. Finally I was ready to try it myself. Kevin Nakano`s web page (link below) was very helpful. His page describes how to do the modification to a CLD-D702. My CLD-1090 is very similar to the CLD-D702. The board layout is slightly different and by describing in general terms how to get the RF tap I hope others with Pioneer CLD-XXXX models can figure
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out how to modify their own machines. (The board) One of the things that scares people away from doing there own mods is the fabrication of the circuit board. A custom etched board makes things easy to put together and minimizes wire lengths but a generic Radio Shack board can be used. The circuit is very simple and the Radio Shack board is small. The circuit board (part # 276-159) has several sets of 5 holes that are connected together. The best way to build the circuit is to choose a spot for the transistor and solder it in. Then using the schematic connect everything together as needed. My version of the circuit uses only 1 transistor, 4 resistors, and 3 capacitors. It can be assembled in 30 minutes. The picture to the right shows the opened laser disc player. Click on the picture to get the big version so you can see in general where the R. F section may be on your player. You can see where I mounted my board. I removed the screw holding the S-video jack and replaced it with a bolt and nut. The bolt holds the new circuit out of harms way. The circuit The basic circuit schematic is similar to circuit #2 from Nakano`s web page. I used a MPS2222A transistor from radio shack. It has a wide (300MHZ) band width suitable for this project. The circuit is a Emitter follower/Common collector. This configuration gives a fairly high input impedance and a low output impedance. This way you won`t load down the RF section of the LD...
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....
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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....
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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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