Frequency meter

The 555 is used in a monostable multivibrator circuit that puts out a fixed timewidth pulse..

Views: 4106 | Votes: 1 | Comments: 0 | Rating: 6 | Rank: 5 | Added: Feb 28, 2013 |

This circuit is meant to be driven by a 1-MHz standard signal of a few volts amplitude. Ul through U5 are 7490 decade counter/divider and produce a division ratio of 100,000:1. Successive divisions of 10 can be tapped off, if desired, between stages. ..

Views: 12 | Votes: 25 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Feb 26, 2013 |

This circuit produces an output frequency that is linearly proportional to the ratio of two input freque..

Views: 2 | Votes: 5 | Comments: 0 | Rating: 8 | Rank: 5 | Added: Feb 16, 2013 |

A simple RF detector circuit using a visual indicator can be useful for an RF output indicator, etc. This circuit was u..

Views: 20 | Votes: 26 | Comments: 0 | Rating: 0 | Rank: 5 | Added: Feb 7, 2013 |

This meter differs from the norm in that it does not use a D`Arsonval movement or digital display to give a reading of the input frequency. Instead, the measured frequency is read from a hand-cali-brated dial. Any audio signal applied to the circuit is amplified by Ul and the resulting output is divided along two paths. In one path, the output signal is applied to the mixer; in the other path, the signal is applied to the input of U2 through SI (a normally open pushbutton.....

Views: 20 | Votes: 82 | Comments: 0 | Rating: 9 | Rank: 5 | Added: Feb 4, 2013 |

The meter uses a zener diode to form square waves from input sine waves. ..

Views: 3862 | Votes: 1 | Comments: 0 | Rating: 2 | Rank: 4 | Added: Feb 1, 2013 |

The figure shows the use of a CD4016 analog multiplex to multiplex the digital outputs back to the FUNCTION input. Since the CD4016 is a digitally controlled analog transmission gate, no level shifting of the digit output is required. The CD4051's or CD4052's could also be used to select the proper inputs for the multiplexed input on the ICM7226 from 2 or 3 bit digital inputs. These analog multiplexers may also be used in systems in which the mode of operation is.....

Views: 3217 | Votes: 95 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Jan 29, 2013 |

The circuit consists of an ICM7208 seven-decade counter (Ul), an ICM7207A oscillator controller (U2), and a CA3130 biFET op amp (U3). Integrated circuit Ul counts input signals, decodes them to 7-segment format, and outputs signals that are used to drive a 7-digit display. Integrated circuit U2 provides the timing for Ul, wliile U3 conditions the input signal to provide a suitable waveform for input to Ul. The 5.24288-MHz crystal frequency is divided by U2 to produce a.....

Views: 49 | Votes: 67 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Jan 9, 2013 |

The ICM7216A or can be used as a minimum component complete Universal Counter. This circuit can use input frequencies up to 10 MHz at INPUT A and 2 MHz at INPUT B. If the signal at INPUT A has a very low duty cycle it may be necessary to use a 74121 monostable multivibrator or similar circuit,..

Views: 5727 | Votes: 28 | Comments: 0 | Rating: 1 | Rank: 3 | Added: Dec 23, 2012 |

The meter uses time averaging to produce a direct current that is proportional to the frequency..

Views: 881 | Votes: 73 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Oct 29, 2012 |

The meter will indicate the frequency from a power generator. Incoming sine waves are converted to square waves by the 100K resistor and the 6,8 V zener. The square wave is differentiated by the capacitor and the current is averaged by the diodes. The average current is almost exactly proportional to the frequency and can be read directly on a 100 mA meter..

Views: 4412 | Votes: 12 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Sep 17, 2012 |

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: 8 | Votes: 14 | Comments: 0 | Rating: 8 | Rank: 5 | Added: Aug 20, 2012 |

This circuit uses the low power ICM7555 (CMOS 555) to generate the gating, STORE and RESET signals. To provide the gating signal, the timer is configured as an astable multivibrator. The system is calibrated by using a 5 M potentiometer for Ra as a coarse control and a 1 jk potentiometer for Rb as a fine control..

Views: 2355 | Votes: 75 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Aug 13, 2012 |

If the input frequency is known, the timer can easily be used as a frequency divider by adjusting the length of the timeing cycle. Figure shows the waveforms of the timer when used as a divide-by-three circuit...

Views: 1372 | Votes: 68 | Comments: 0 | Rating: 4 | Rank: 7 | Added: Aug 11, 2012 |

In the next stage, the product of R2 and C2 should be 10 x that of the preceding stage (±2%). R2 should be between 27K and 10 M..

Views: 2011 | Votes: 23 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Aug 7, 2012 |

The circuit shows how two tone decoders set up with overlapping detection bands can be used for a go/no go frequency meter. Unit 1 is set 6% above the desired sensing frequency and Unit 2 is set 6% below the desired frequency. Now, if the incoming frequency is within 13% of the desired frequency, either Unit 1 or Unit 2 will give an output. If both units are on, it means that the incoming frequency is within 1% of the desired frequency. ..

Views: 4393 | Votes: 12 | Comments: 0 | Rating: 6 | Rank: 6 | Added: Jul 31, 2012 |

This is a minimum component complete Universal Counter. It can use input frequencies up to 10 MHz at INPUT A and 2 MHz at INPUT B..

Views: 5088 | Votes: 14 | Comments: 0 | Rating: 0 | Rank: 5 | Added: Jul 25, 2012 |

The turn-on and turn-off characteristics of two complementary transistors can be combined to attain nonselective frequency tripling. The resulting circuit handles any periodic waveform with nonvertical sides. Each input signal peak produces three output signal peaks. The additional peaks occur where the input signal causes saturation of one of the two transistors. The circuit operates over a frequency range from dc to the upper limits of the complementary transistor pair. ..

Views: 4634 | Votes: 29 | Comments: 0 | Rating: 9 | Rank: 4 | Added: Jul 22, 2012 |

The ratio of capacitors Cl and C2 determines division. With a positive pulse applied to the base of Ql, assume that Cl = C2 and that Cl and C2 are discharged. When {31 turns off, both Cl and C2 charge to 10 volts each through R3. On the next pulse to the base of Ql, Cl is again discharged but C2 remains charged to 10 volts. As Ql turns off this time, Cl and C2 again charge. This time C2 charges to the peak point firing voltage of the PUT causing it to fire. This discharges.....

Views: 1713 | Votes: 97 | Comments: 0 | Rating: 7 | Rank: 5 | Added: Jul 19, 2012 |

In this configuration, the display reads hertz directly. With pin 11 of the ICM7027 A connected to V00, the gating time will be 0.1 second; this will display tens of hertz as the least significant digit. ..

Views: 34 | Votes: 15 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Jul 13, 2012 |