In the figure we have a circuit with two operational amplifiers 741 capable of doubling the frequency of a signal with rectification. The circuit is from an English publication from 1978, but it can also be assembled with other operational ones. The symmetrical power supply and the maximum frequency of the input signal is limited to a few tens of kilohertz. Input and output waveforms are shown in the figure.
| Clique na imagem para ampliar |
