This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time. The power is from a battery, the consumption of 1.65 mA and the power of about to 1 mW.
This circuit is from the 80's but uses common components today. The relay is voltage sensitive...
Found in Datel's documentation from the 1980s, this circuit makes use of the company's operational...
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...