The starter circuit shown in the figure was found in an old European documentation. The circuit makes use of an SCR which is still common and the diac can be of any type.
This circuit is from a technical publication on voltage regulators from 1977. The transistor can...
This analog frequency meter for low frequencies was found in Radio Electronics magazine from July...
This circuit is from the 1983 Intersil Databook. The circuit operates on a 9 V battery and has a...