Power Control

Temperature control is achieved using the REF-02 +5 V Reference/Thermometer and a CMP-02 Precision Low Input Current Comparator. The CMP-02 turns on a heating element driver (Ql) whenever the present temperature drops below a setpoint temperature determined by the ratio of Rl to R2..

Views: 1873 | Votes: 89 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Feb 27, 2013 |

The governor following is intended to regulate the light intensity incandescent 220 V. The components in a relatively few, which means it can easily be mounted onto a small plate. After the build, we recommend you place it inside the box which is flush mounted switch ON / OFF the lamp. Setting the switch to ON, the lamp will light after about 400 msec, a delay is probably negligible. But when the state enters the ON OFF, then mesolathei a period of 20 sec, the brightness.....

Views: 4468 | Votes: 49 | Comments: 0 | Rating: 7 | Rank: 4 | Added: Jan 25, 2013 |

In both circuits, the SCR (and thereby the lamp) can be latched on by momentarily closing SI, thereby fe..

Views: 7 | Votes: 75 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Jan 12, 2013 |

This switch uses four CD4013 BE dual flip-flops, an inverter, and an optoisolator to drive a triac. The circuit can switch 25-A ac load current. A standard 4x3 telephone keyboard is used to enter a 6-digit code. In case of a wrong code, a signal is available to activate ah alarm...

Views: 16 | Votes: 72 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Dec 28, 2012 |

The purpose of this circuit is to control the water temperature in a hot-water heating system. What it does is to lower the boiler temperature as the outside air temperature increases. The op amp is used as a comparator. Thermistor TH2 and R2 form a voltage divider that supplies a reference voltage to the op-amp"s inverting input. Thermistor TH2 is placed outdoors, and the values of TH2 and R2 should be chosen so that when the outside temperature is 25 °F, the.....

Views: 581 | Votes: 81 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Dec 5, 2012 |

This solid-state switch senses and interrupts an overcurrent condition within 2 /is. II allows the circuit to float. IC..

Views: 13 | Votes: 60 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Oct 20, 2012 |

The sensor is a standard TO-5 or TO-46 package. For surface or air temperature sensing. Small clip-on heat sinks can be used. A simple probe can be made using heat-shrink tubing and RTV silicon rubber. Three-leads-plus-shield cable is a good choice for wire with the shield connected to pin 4. The controller can be used for baths, ovens, oven-temperature protection, or even home thermostats..

Views: 2463 | Votes: 48 | Comments: 0 | Rating: 3 | Rank: 5 | Added: Sep 11, 2012 |

This converter can accommodate wide inputvoltage swings, such as the 8 to 15-V swing typical of a 12-V sealed lead/acid battery. The low battery output indicates when input voltage drops below 8V. ..

Views: 4 | Votes: 16 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Aug 20, 2012 |

Nowadays the batteries are gaining more and more power, being the only components that fail to provide energy for portable electronic devices. The evolution is rapid, leading manufacturers electronic equipment to attempt to minimize the consumption of their products so that they can operate for several hours using simple batteries trade. In spite of the efforts of manufacturers, the device will absorb a zero power not yet invented. Thus, both small and if the current.....

Views: 4999 | Votes: 11 | Comments: 0 | Rating: 4 | Rank: 4 | Added: Jul 31, 2012 |

This circuit senses the video from the VCR. When the VCR is turned on, video signal is amplified by U3A and to drive Ql, activating Kl. In this manner, it is not necessary to turn on and off two video devices every time. In many cases, this avoids the use of a cable box,..

Views: 8 | Votes: 22 | Comments: 0 | Rating: 3 | Rank: 5 | Added: Jul 18, 2012 |

This circuit allows a 4-to 20-mA current loop to control an isolated SCR drive. IC1A and are one-shots. Q2 detect..

Views: 3 | Votes: 99 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Jul 11, 2012 |

This circuit, adds a power-down function to analog I/O ports (for example, the AD7769 and AD7774). Moreover, the diodes ordinarily needed to protect the devices against power-supply mis-sequencing can be eliminated (see the figure).In the circuit, MOSFETs Ql and Q2 switch the +5- and +12-V supplies, respectively, in a sequence controlled by two cross-coupled CD4001 CMOS NOR gates (U1C and U1D). The sequence in which power is applied is important: The controlled circuits.....

Views: 6 | Votes: 7 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Jul 1, 2012 |

A current control to temperature regulate a soldering iron uses a high-voltage integrated regulator, TL783 (Ul)...

Views: 12 | Votes: 0 | Comments: 0 | Rating: 4 | Rank: 5 | Added: May 13, 2012 |

The AD590 produces a temperature-dependent voltage across R (C is for filtering noise). Setting R2 produces a scale-zero voltage. For the Celsius scale, make R = 1 K and Vzero = 073 volts..

Views: 942 | Votes: 14 | Comments: 0 | Rating: 0 | Rank: 5 | Added: May 10, 2012 |

The SCR is wired across the trigger circuit of the flash gun. Normally, the SCR is off, so the flash gun is able to cha..

Views: 4 | Votes: 6 | Comments: 0 | Rating: 4 | Rank: 5 | Added: May 3, 2012 |

This proportional control crystal oven heater uses lead/lag compensation for fast setting. The time constant is changed with R4 and compensating resistor R5..

Views: 2968 | Votes: 8 | Comments: 0 | Rating: 3 | Rank: 5 | Added: Apr 12, 2012 |

The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. It also drives the 4 digit display, and switches the AC and load relays. The basic operation is as follows: While AC power is available, the battery voltage is constantly monitored and topped off as needed. When the AC power fails, the load relay engages the 12-volt system. This connects to lights, fans, and other 12 volt devices as needed. Should the battery voltage fall.....

Involvement is a modified version of the classic circuit of automatic level control signal used in tape recorders. The purchase price of the components (using TL072) does not exceed CZK 60 for a channel. For a range of entry level audio signal may be replaced by the operation, which would be matched signal level so as not to overmodulation or podmodulován. The device performs a kind of correction pseudointeligentní volume. The circuit is also under the control settings.....

This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages. The circuit features auto reset and utilises easily available components. It makes use of the comparators available inside 555 timer ICs. Supply is tapped from different points of the power supply circuit for relay and control circuit operation to achieve reliability. The circuit utilises comparator 2 for control.....

A simple and inexpensive implementation using an eight-pin 12C508 controller (Microchip Technology, Chandler, AZ) provides both bit-rate detection and a synchronous, appended-clock output from an asynchronous input-data stream (Figure 1a)...