This organ, played by a probe was found in no old documentation, but it can be easily implemented these days. The integrated circuits are 555. The trimpot allows individual tuning of the keys.
This circuit is suitable for calibrating old oscilloscopes. It was found in a 1980s documentation. It...
We found this configuration in a 1975 publication. It can be implemented easily, as it uses only...
The original version of this circuit was obtained in a 1995 magazine Electronics Now. The magazine no...