This circuit was found in Motorola documentation from 1966. The lamps are according to power and current according to the components used which are uncommon today.
This circuit was published in an English magazine from 1977, but it can be easily assembled since...
This circuit was obtained in an English magazine from 1978. We can easily assemble it because all...
This amplifier was obtained from the CA3140 datasheet, an operational amplifier with JFET at the...