This circuit produces sounds of 6 different notes depending on the keys activated. The circuit is from a Radio Electronics from May 1965. The transistor must be equipped with a heat radiator.
Found in Maxim documentation from the 90s, this circuit makes use of components from the period. The...
Found in an English Maplin magazine in 1983, this circuit has an RIAA equalization. We suggest its...
In the figure we have a way of obtaining a 13,2 V with current up to 5 A using an integrated 7812...