Found in a 90s Popular Electronics, this mixer can be expanded to more channels. Transistors can be modern general-purpose equivalents.
3KSMC21AH 3000W Transient Suppressor from Taiwan semiconductor Taiwan Semiconductor is making...
This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be...
We find this circuit in a 1970 publication. Transistors can be replaced by current equivalents and LDR is...