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 was obtained in an English publication of 1993. It is an amplifier for...
This common crystal oscillator configuration was found in a 1980s American documentation. The...
This circuit was found in an old SCR manual. The types used are from the time, but the setting can...