We found this circuit with the LM3914 IC in a Radio Electronics magazine from June 1985. The circuit is intended for monitoring the battery voltage through an LED bar.
This amplifier for effects on musical instruments can be mounted with BC549 transistors. The...
We found this circuit in documentation from National Semiconductor. For the medium wave range the...
According to what is said, the bugs are the female insects (mosquitoes, muriçocas and others)....