We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer easily found, but if used on this amplifier it provides excellent reproduction quality.
This circuit allows you to program a resistance by combining the selected resistors. The circuit...
August 2016 - It can be obtained from Mouser Electronics the new clock buffers HMC7043 of Analog...
This amplifier stage, obtained in a 1980 publication, has a low input impedance and a high output...