Circuit diagrams and schematics - Electronic projects

The components connected to 555 timer IC1′s pin 2 provide a trigger synchronized with the ac input’s zero crossing. In conventional 555 fashion, R1, R2, and Cdetermine IC1′s period. However, the RC delay network connected between IC1′s pins 1 and 5 causes IC1′s period to approach its full value only gradually, rather than instantly at [...]

With this circuit you can can check that which dot of the circuit is Positive Volt or Negative Volt which. This cheap circuit uses the a little component is will appropriate apply with an automobile or motorcycle. This circuit works during Voltage between 5-15V. When build volt supply of circuit LED 2 pcs. of stick [...]

Linear scale – Small size 40 to 208 beats per minute * Q1 & Q2 provide linear frequency operation of IC1 following P1 resistance variation. * Q3 was added in order to obtain a louder click, similar to clockwork metronomes. * A 12V micro battery was used to obtain a higher output power and more [...]