This is a distillation of my ` design notes `, with more practical details as I move along with the construction, and (in due course) some pictures. Right at the moment I`m using it as a kind of progress report for myself - it`s a mixture of immediate plans and actual construction, so isn`t too clearly structured! The signal control circuit is on
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0. 1" matrix board for the time being - after hours of trying to work out exactly what was going to go where on a PCB, I decided to start soldering everything together anyway to make a prototype. Right now the board is getting pretty crowded, and there isn`t room for all the traces. For the moment I want to keep one or two options open, for instance the volume control and the layout of the balanced connections. At some point in the not-too distant future, though, I hope I`ll be more or less satisfied with what I`ve got, and then I`ll build a proper set of PCBs for the project, which will be a chance to tidy it all up, and of course add such niceties as a ground plane if I can. I use sealed relays with gold-plated silver contacts, type 53W/1 from Fujitsu, for all switching, including output polarity and mono/stereo selection. The 5V power supply for the relays is separately regulated from the ones for the TTL logic and the indicator LEDs to avoid glitches. All op-amps are Burr-Brown OPA2604, with one pair of LM317/337 regulators for each stereo channel. The gain of the output stage is +10dB, while the input buffers are unity gain except for the CD input (see below). If an unbalanced input is selected, the balanced signal is generated by inverting the input before the volume control, so that antiphase signals are always present in the volume control and output stages - this ought to decrease hum and RF pickup and improve 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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