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.
The circuit is from the 1990 Motorola Linear Databook, but can be implemented with other operating...
This mechanical reverberator circuit for guitar was found in the February 1970 issue of Radio...
The battery charger shown in the figure uses two 60 W incandescent bulbs in series to limit the...