This low power bass booster is from the 1977 National Semiconductor Audio Handbook. The circuit is powered by 6 to 9 V voltages and the feedback determines the enhanced bass range.
This amplifier, common in 1986, uses a hybrid integrated circuit that can offer some difficulty to obtain...
Operational amplifiers with field effect transistors at the input are ideal for applications where...
In the figure we have the configuration of a voltage regulator with 3 transistors. The components depend...