We found this circuit in the Linear Applications Hanbook of the National Semiconductor in 1994. The semiconductors used are not very common today.
This circuit can use common operational amplifiers according to the supply voltage. One suggestion...
This circuit can generate signals from 1 Hz to 20 Hz in 2 Hz ranges. The table next to the diagram...
This amplifier, common in 1986, uses a hybrid integrated circuit that can offer some difficulty to obtain...