We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but can be used with LED alerts. The buzzer is the 12 V type that contains the built-in oscillator. The other components are absolutely common today.
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but can be used with LED alerts. The buzzer is the 12 V type that contains the built-in oscillator. The other components are absolutely common today.
