The components used in this National Semiconductor circuit are not common today, but the configuration can be adapted to use more modern components.
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...
The frequency of this oscillator depends on the coil and capacitors C1 and C2. For 1 MHz L1 is...
This circuit monitors extra-low frequency (ELF) fields. We found it in an American documentation from the...