120VAC POWER LINE UNDER VOLTAGE ALAR

This circuit will activate a beeper alarm whenever the AC line voltage is less than 100vac.

Comments

Post a Comment

Popular posts from this blog

HIGH PASS ACTIVE FILTER COLLECTION

Image
This is a collection of inverting and non-inverting active high pass filter circuits.  I included one, two three, four and six pole filter circuits.  You can change the component value ratios shown to achieve any frequency cut-off you may need. The circuit does not specify an operational Amplifier.  The circuits should be used to select the needed resistor and capacitor components for a particular frequency knee and  slope.
Read more

60Hz Notch Filter

Image
High input impedance Amplifiers are ideal for buffering high impedance networks. Here a twin-T notch filter is shown to reject 60Hz signal content by more the 60dB. Small size, low valued capacitors can be used at such a low frequency with high valued resistors when using a CMOS op Amp… 
Read more