about 2 weeks ago - No comments
Need electronic dog whistle? It is widely known that dogs can hear sounds with frequencies higher than the humans cant hear. Sound frequencies higher than 20 kHz can be hardly detected by humans but animals are very sensitive to it. Basing this fact, an electronic dog whistle can be constructed and used to call dogs More >
about 1 year ago - No comments
This DC power supply controller is controlled by pulse width modulation PWM, generated by the circuit around timer IC2 7555 according to the formula:
Duty cycle = ((R1 + (VR1/2)/(R1+R2+VR1)) x 100%
Diode D1 is used to bypass resistor R2 and half the effective resistance of the “lower” section of VR1, allowing the duty cycle to be More >
about 1 year ago - 17 comments
The metal detector circuit shown here must represent the limits of simplicity for a metal detector, yet the design works surprisingly well. It uses just one 40106 hex Schmitt inverter IC, a capacitor and a search coil – and of course the batteries. A lead from IC1b pin 4 needs to be attached to a More >
about 1 year ago - 2 comments
With this electronic dog caller circuit you can call your dog. Dogs can hear audio frequencies higher than humans do. This dog whistle schematic does not guarantee that only dogs can hear the sound, canaries, childs and even some adult peoples might hear the sound.
With 9V supply this power oscillator ( N1 … N3, R1 More >
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This PWM Controller circuit is ideal for controlling small motors with 2A maximum current consumption. For higher currents you need additional cooling for T2 and increase C2 value. This pwm motor controller is using the fact that the small dc motor has the revolution speed depending on the power supply voltage.
