Misc. Circuits

Description: This page contains various small circuits created over time. Some circuits are trivial, while others are more complex, but all are intended to be useful for a variety of projects. Most include both the schematics and the source (KiCad) files. One specific circuit is a touch sensor with adjustable sensitivity that outputs a digital signal indicating whether it is being touched. It was originally designed as a cymbal mute sensor for electronic drum hardware, but it can also serve as a touch-sensitive switch. The metal touch plate should be connected to P1, while the digital output is available on P2. The value of the variable resistor may vary based on conditions and the size of the capacitive touch plate; a value of 200k ohms has been effective, but adjustments may be necessary.

The described touch sensor circuit is designed to detect physical touch through a capacitive sensing mechanism. It operates by measuring changes in capacitance caused by the proximity of a conductive object, such as a finger, to the metal touch plate. The circuit consists of a capacitive touch plate connected to pin P1, which serves as the input for the sensor. The digital output is available on pin P2, providing a high or low signal based on the detected touch.

To optimize the sensitivity of the touch sensor, a variable resistor is included in the circuit. This resistor allows for fine-tuning of the sensor's responsiveness to touch, accommodating different environmental conditions and the physical characteristics of the touch plate. While a standard value of 200k ohms has been noted as effective, it is essential to experiment with different resistor values to achieve the desired sensitivity for specific applications.

In practical applications, this touch sensor can be integrated into various electronic projects beyond its initial design for a cymbal mute sensor. It can be utilized in interactive installations, touch-sensitive lighting controls, or as a simple switch in hobbyist electronics. The provided KiCad files facilitate easy modifications and adaptations for specific project needs, enabling users to customize the circuit layout and component values as required.

Overall, this touch sensor circuit exemplifies versatility in electronic design, providing a foundation for various creative applications while allowing for user-specific adjustments to enhance performance.Included on this page are various small circuits I have created over time. Some are trivial, some are a bit more complex, but hopefully all are useful in a variety of projects. Most include both the schematics as well as the source ( KiCad ) files. This is a touch sensor with adjustable sensitivity, which will output a digital signal specfying whe ther or not it is being touched. I originally created it as a cymbal mute sensor for my electronic drum hardware, although it could be used for any sort of touch sensitive switch. You would connect the metal touch plate to P1; the digital output is on P2. The exact value of the variable resistor will differ based on conditions, size of capacitance touch plate, etc; 200k seems to work for me, but you may need to adjust this a bit.