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Search results: 130   Output: 11-20
  1. A flashing LED signals the necessity to water a plant Very low current consumption - 3V powered circuit Circuit diagram: Parts: R1, R4 470K 1/4W Resistors R2 47K 1/2W Trimmer Cermet or Carbon R3 100K 1/4W Resistor R5 3K3 1/4W Resistor R6 15K 1/4W ...
    29-09-2009
  2. Based on electromagnetic-field radiation. Place it under the pillow - Built-in timer. Circuit diagram: Parts: R1,R5 1K 1/4W Resistors R2 10K 1/4W Resistor R3,R6 10M 1/4W Resistors R4,R7 2M2 1/4W Resistors R8,R9 4K7 1/4W Resistors C1,C7 47µF ...
    20-08-2009
  3. Double-tone Police sound Single-tone old ambulance sound Circuit diagram: Parts: R1,R3 470K 1/4W Resistors R2 680K 1/4W Resistor R4 82K 1/4W Resistor R5 330K 1/4W Resistor R6 10K 1/4W Resistor R7 33K 1/4W Resistor R8 3M3 1/4W Resistor C1,C5 ...
    10-08-2009
  4. Build a dark-activated switch with only a triac, a photocell, and a resistor. Abel Raynus Assume that you have a device that receives its power from the main 120 or 220V-ac line and you need to add a switch between the ac line and the device so ...
    Circuits » Domestic · Supply » Q4004LT
    06-08-2009
  5. Use this circuit to tell which game player presses a button first. Vasil Borodai The circuit in Figure 1 lets you indicate which game player presses a button first. Each button has a corresponding LED that indicates the pressing of the button. All ...
    06-08-2009
  6. Max. range: 9,950 meters with two digits Slip it in pants' pocket for walking and jogging Circuit diagram: Parts: R1,R3 22K 1/4W Resistor R2 2M2 1/4W Resistor R4 1M 1/4W Resistor R5,R7,R8 4K7 1/4W Resistor R6 47R 1/4W Resistor R9 1K 1/4W Resistor ...
    04-08-2009
  7. Particularly suitable for cellulite treatment 3V battery supply, portable set Circuit diagram : Parts: P1 4K7 Linear Potentiometer R1 180K 1/4W Resistor R2 1K8 1/4W Resistor (see Notes) R3 2K2 1/4W Resistor R4 100R 1/4W Resistor C1 100nF 63V ...
    29-07-2009
  8. Compact circuitry using small-size parts only. Can be wired in parallel to existing switches Circuit diagram: Parts: R1 Photo resistor (any type) R2 100K 1W Resistor R3 200K 1/2W Trimmer Cermet R4,R7 470R 1/4W Resistors R5 12K 1/4W Resistor R6 1K ...
    28-07-2009
  9. Continuous monitoring of the mains voltage is required in many ap- plications such as manual voltage stabilisers and motor pumps. An analogue voltmeter, though cheap, has many disadvantages as it has moving parts and is sensitive to vibrations. The ...
    24-07-2009
  10. High sensitivity, portable temperature comparator detects draughts around doors, windows, etc. Circuit diagram: Parts: 22K Linear Potentiometer (See Notes) R2 15K @ 20 C n.t.c. Thermistor (See Notes) R3 10K ¼W Resistor R4, R5, R7, R9 22K ...
    21-07-2009
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