Voltage to Frequency Converter 2 (CB9448E)

Found in an EDN from the 90s, this circuit uses operational amplifiers from that time, which are uncommon nowadays.

| Clique na imagem para ampliar |

Crystal filters (CB20276E)
Below are two frequency filters for receivers using crystals. The crystals must have the frequency of...
Broadband MOSFET amplifier (CB9180E)
Found in Popular Electronics from the 90s, this circuit has 7,500 ohm of input impedance. The circuit...
Optoelectronic detector (CB15608E)
In this circuit the signal from the phototransistor is amplified by a Darlington stage and then...