This circuit appears elsewhere in this section, obtained from other documentation. The circuit is for lead-acid batteries and the lamp can be replaced by high brightness LEDs.
This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very...
This 2009 circuit is a bilateral call warning. Easy to build, using light communication between two...
This circuit for shunt motors was found in an American 1980s documentation. The SCR should be rated...