générateur de mélodie programmable

Low-power IC voltage regulators of the 7 8L series are now so cheap that they represent an economic alternative to simple zener stabilisers. In addition they offer the advantages of better regulation, current limiting/short circuit protection at JOO mA and thermal shutdown in the event of excessive power dissipation. In fact virtually the only way in which these regulators can be damaged is by incorrect polarity or by an excessive input voltage.