If the unit has been sitting idle for a long period time (dead AAA batteries) and you see only garbage on the display or the unit doesn`t operate, the first item required is probably a new internal lithium battery. Although the unit was exceptional for its day, a major flaw with the unit was allowing the firmware to be lost if this battery ever lost power (no flash memory back then!)
Click here to download the full size of the above Circuit.
. I don`t think the designers ever thought the unit would be idle for long periods of time with the user-replaceable batteries going low. This battery is available at Digi-Key and must be soldered to the PCB. You must take the unit apart and unsolder the old battery, then solder in the new one. Once you have replaced the lithium battery, you are ready to reprogram the micro controller. It should be noted that the front panel cover should be removed very carefully until you know just how easy it is when its done right (very slightly pull up on it as you slide it over the `bump`). Also, verify the hidden switches (documented in the manual), are set correctly. Get the serial interface manual and read it carefully. Build the serial interface circuit then download the programs required to reload the OS. Once you have the serial unit, the whole process takes less than 15 minutes. Also included, is a program that allows you to save and restore the IR key code information. Highly recommended on this unit since it can be fairly easy to lose the memory. This makes it a snap to restore it.
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.....
characters left: