This is an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building, troubleshooting and electronics experience is assumed. Additionally, electronic equipment ownership (scope, meters, etc. )
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is taken for granted. If you are interested in building this project please read the entire page before ordering PC boards to ensure that the information provided is thorough enough for you to complete the project successfully. If you bought a prototype board these links show the necessary kludge. You need to add a 470K resistor between the -12V point at U3 pin 4 and the gate of Q11. Support docs for the prototype boards are right here: Page 1 shows the heart of the sequencer which is U1 (CD4017B CMOS Decade Counter with 10 Decoded Outputs). This chip has ten outputs (0 thru 9), each of which goes high sequentially (while the others are low) when the clock input is clocked (goes from low to high) while the clock enable input is low. This circuit uses the clock and the reset inputs only. The Clock enable is tied to ground and the Carry out is not used. The CLK circuit point and the RST circuit point both come from page two of the schematic (explained below). The circuitry on page two generates the clock pulses, manual step pulses and reset pulses. A question I know I`ll get is: "Why did you use a 12 position switch " The answer is: "Because I often see 12 position switches for sale on surplus sites and I rarely see 9 position switches (which is all you actually need). " As shown below you just wire the extra terminals to the last position used and you`re good to go. The 0 thru 9 outputs of U1 go to: Points X0 thru X9, which...
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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