This circuit activates a recorder from the signal obtained from a telephone line in the service. It is used to make automatic call recordings.
This two-channel DC volume control uses a transconductance operational amplifier. The transistors can be...
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This is the project we have described, as found in a 1981 documentation. In the figure we show the...