741 Filter (CB24265E)

The 1 kHz tuned filter shown uses a 741 op-amp. The components can be re-scaled to suit the desired frequency.

1 W amplifier (CB8948E)
This circuit was obtained in a 90s American documentation. The integrated circuit used is uncommon...
Audio Equalizer (CB10401E)
This circuit was obtained in a 1980 English magazine, but it can be easily assembled today, since...
Diode Test (MSB064E)
This configuration is used to display the characteristic curve of a diode in the virtual...