One very simple metronome circuit npn and pnp transistor and one capacitor potentiometer resistance buzzer can be connected to the audio output to speakers or headphones + 5v dc supply voltage can be
Bcxxx bdxxx transistors used for the different series can I try 2s945 (npn) 2sa733 (PnP) I used 47k resistors. 16v 4.7uF capacitor values can be altered in different hues 270k potentiometer clicks if you use the higher the value the lower the isis-metronome simple simulation
metronome circuit diagram
metronome circuit test
metronome circuit breadboard installed
Published: 2009/02/09 Tags: audio control circuits, simple circuit projects
Simple Test Method for PTC Thermistors
High-power PTC thermistors PTC to test a simple practical method of this type generally used in tlevizyo and monitor control rarely fails for this reason they will not be forgotten in supply failure, keep in mind;)
220v ac supply given the PTC sturdy lamp gives light after an instant PTC heats the internal resistance increases and the lamp goes PTC short circuit is open circuit to give continuous light lamp does not light
PTC Tester