Symbols of Antennas / Aerials

PDF: https://www.electrical-symbols.com/electrical-electronics-pdf/Antennas_Aerials_Symbols.pdf
WEB: https://www.electrical-symbols.com/electric-electronic-symbols/antenna-aerial-symbols.htm

Símbolos de Autotransformadores

El autotransformador es similar al transformador, pero solo tiene un devanado.

https://www.simbologia-electronica.com/simbolos-electricos-electronicos/simbolos-transformadores-electricos.htm#simbolos_autotransformadores

Symbols in Fire Alarm Systems

A fire alarm system is a security installation that detects and activates the alert by means of sensors in case of locating smoke or fire in the spaces it is protecting.

PDF: https://www.electrical-symbols.com/electrical-electronics-pdf/Fire_Alarm_Systems_Symbols.pdf
WEB: https://www.electrical-symbols.com/electric-electronic-symbols/fire-alarm-systems-symbols.htm