Inside Circuits

This circuit shows a typical over/under-voltage fault monitor for a single supply. The upper trip points, controlling OUT 1, are centered on 5.5 V with 100 mY of hysteresis Wu = 5.55 V, "L = 5.45 V); and the lower trip points, controlling OUT 2, are centered on 4.5 V, also with 100 mV of hysteresis. ..

Views: 2 | Votes: 77 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Mar 28, 2013 |

HA-5190 can drive the 75-0 coaxial cable with signals up to 2.5 V pk-pk without the need for current boosting. In this circuit, ..

Views: 4 | Votes: 40 | Comments: 0 | Rating: 0 | Rank: 5 | Added: Mar 28, 2013 |

Ll and L2 form a tuned transformer. About a 1:3 turns ratio is optimum. L2 and CI tune to the desired frequency. The fre..

Views: 4 | Votes: 52 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Mar 28, 2013 |

An op amp is used to interface between a fiberoptic system and the MOS SCR to multi-cycle, half-wave control of a load. This receiver has two complementary outputs, one at a quiescent level of about 0.6 V and the second at 3 V. By adding a 4.7 V zener in series with the return bus, the effective VqC becomes 5.3 V and also the 0.6 V output level is translated up to about 5.3 V...

Views: 2521 | Votes: 99 | Comments: 0 | Rating: 8 | Rank: 5 | Added: Mar 27, 2013 |

This circuit permits direct connection of composite video signals from video games and microcomputers to the antenna terminals of TV sets...

Views: 4985 | Votes: 69 | Comments: 0 | Rating: 9 | Rank: 4 | Added: Mar 27, 2013 |

Spikes in the center of a sawtooth wave are eliminated in this circuit..

Views: 4061 | Votes: 91 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Mar 27, 2013 |

This circuit oscillates without the crystal. With the crystal in the circuit, the frequency will be that of the crystal..

Views: 3195 | Votes: 94 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Mar 27, 2013 |

Many systems require one or more relatively low-current voltage sources which can be programmed tna few predetermined levels. The circuit shown above produces positive output levels, but could be modified for negative or bipolar outputs. Q1 is the series regulator transistor, selected for the required current and power capability. ..

Views: 9 | Votes: 105 | Comments: 0 | Rating: 0 | Rank: 5 | Added: Mar 27, 2013 |

This circuit uses only one JC, either 1, LM393 dual comparator or 1/z, LM339 quad comparator. RV1 and RV3 set the full scale reference voltage, and RV2 and RV4 set the switching thresholds to a value between 0 V and the full-scale reference. ..

Views: 14 | Votes: 57 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Mar 27, 2013 |

A four output Hall sensor combined with a few logic gates produce this digital compass. The NOR gates resolve the four Hall..

Views: 13 | Votes: 5 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Mar 27, 2013 |

Ql senses IR from heat sources, causes U1 to switch, activates optocopuler Ul, and triggers TR1. This contro..

Views: 10 | Votes: 23 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Mar 27, 2013 |

If you live in the frozen north, knowing your engine-block heater is working is a comfort. This device will let you know if yours is okay. Plug in PL1 to your power outlet. NE1 should light. Then, plug in the block heater. Depressing SI should cause the indicator to get brighter. ..

Views: 1 | Votes: 91 | Comments: 0 | Rating: 9 | Rank: 5 | Added: Mar 27, 2013 |

A high performance op-amp that sets a new standard of excellence in noise performance only 0.9nV/Hz with low source resistances. Total harmonic distortion is less than 0.01%. The op-amp is suitable for use in high quality audio, low noise frequency synthesizers, infrared detectors etc. ..

Views: 4928 | Votes: 83 | Comments: 0 | Rating: 2 | Rank: 10 | Added: Mar 26, 2013 |

This audio converter circuit maintains 40 dB of isolation between the two halves of entry and exit of a four-line son, while allowing a line connecting two son. A balancing potentiometer, R, adjusts the gain of zero lC2to crossing the inlet to the outlet. ..

Output-clamp diodes are mandatory because loudspeakers are inductive loads. Output LR isolation is also used because audio amplifiers are usually expected to handle up to 2 µ¥ load capacitance. Large, supply-bypass capacitors located close to the IC are used so that the rectified load current in the supply leads does not get back into the amplifier, increasing high-frequency distortion. ..

Views: 3074 | Votes: 94 | Comments: 0 | Rating: 4 | Rank: 4 | Added: Mar 26, 2013 |

A simple X-band radar detector is capable of indicating changes in rf radiation strength at levels down to 2 mW/cm2. Radiation falling on the detector diode, produces a voltage at the input of an amplifier whose gain may be adjusted to vary the range at which the warning is given. The amplifier output drives a voltage comparator with a variable threshold set to a level that avoids false alarms. The comparator output is connected in the wired-OR configuration with the open.....

Views: 1518 | Votes: 69 | Comments: 0 | Rating: 5 | Rank: 3 | Added: Mar 26, 2013 |

The MFODllOO PIN diode requires shielding..

Views: 3006 | Votes: 46 | Comments: 0 | Rating: 4 | Rank: 5 | Added: Mar 26, 2013 |

A diode (IN4148) is used as a temperature sensor. IC2 is an A/D converter with BCD output. A refere..

Views: 5 | Votes: 104 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Mar 26, 2013 |

This system uses an MM5369 IC to derive a 60-Hz signal from a TV burst crystal (3579 MHz). F8 and V9 producc a 10-Hz and 1-Hz signal from this 60-Hz signal...

Views: 7 | Votes: 69 | Comments: 0 | Rating: 0 | Rank: 5 | Added: Mar 26, 2013 |

The infrared remote-control tester uses a sensitive PN-type solar sensor that is connected directly to a Darlington amplifier made up of transistors Q1 and Q2. Biasing is provided by R1 and PI, a variable resistor that serves as a sensitivity control. The collector lead of Q1 is the output lead of the Darlington amp, and it is connected to a red LED and the primary of transformer Tl. The function of Tl is to convert the low-voltage output signal to a level high enough to.....

Views: 9 | Votes: 96 | Comments: 0 | Rating: 4 | Rank: 5 | Added: Mar 26, 2013 |