300 to 3,000 Hz Speech Filter (CB6543E)

Found on an 80's Radio Electronics, this two-section circuit is designed to pass the frequency range of the human voice.

| Clique na imagem para ampliar |

High Impedance Differential Amplifier LM324 (CB15183E)
This circuit was found in the SGS manual of linear integrated circuits of 1982. The CMRR depends on...
Optical PFM Receiver (CB15961E)
In the figure we have a receiver for frequency modulated light signals (see the transmitter in...
High Stability Voltage Reference (CB1211E)
In the figure we have a high stability voltage reference, providing a voltage of 10 V at the...