6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

High Fidelity Preamplifier (CB13215E)
This circuit is from old Motorola documentation, from the 70s. The integrated circuit is difficult to...
Pre-Emphasis on 1500 Hz (CB13685E)
This circuit reinforces signals in a frequency range between 1500 and 2000 Hz for use in...
Current Meter (CB5133E)
This circuit was obtained from a manual of the integrated circuit itself, but can be applied to...