Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Converters: Frequency Circuits
Converters -- Main Page
Last Updated on: Thursday, April 07, 2016 01:00 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

455 Khz MF to AF converter used for DRM reception in a Yaesu FRG-100 receiver -  This is a very sensitive homemade MF converter/interface allowing you to receive the DRM radio (Digital Radio Mondiale) with your general coverage receiver and a soundcard. It can also be used for software radio apllications, and other MF to LF experiments (not just DRM, and surely not just for the Yaesu FRG-100)!. . .  [by Guy Roels ON6MU]


750 MHz Power Doubler & Push-Pull CATV Hybird Modules Using Gallium Arsenide 3/21/96  -  Application Note  Doc #920. . .  [California Eastern Laboratories]


900-Mhz Down Converter Consumes Little Power -  06/22/95 EDN Design Idea   Most 900-MHz down-converter designs are proprietary and, thus, are unavailable to the industry. The designs that are available are usually discrete or require high voltage, which excludes them from the portable market. The down c. . .  [by Ronald Mancini and Raphael Matarazzo, Harris Semiconductor, Melbourne, FL]

A 2320 MHz to 144 MHz RX Converter (old) -  Older design - not recommended, description with schematics for the LNA and the Mixer. . . .  [Herbert Dingfelder's web site]


A 50 MHz to 28 MHz RX Converter -  Circuit description in English and in German, a picture of the circuit and the schematic diagram. . . .  [Herbert Dingfelder's web site]

A programable 2.3-2.4GHz to 144 MHz Receiver-Converter (new) -  A simple but well working design, a complete description with schematics and pictures. . . .  [Herbert Dingfelder's web site]


Charge Pump Doubles Negative Voltage -  Application Note #782. . .  [Maxim Integrated]


Delay Line implements Clock Doubler -  07/18/96  EDN Design Idea   Timing delays are undesirable in most digital circuits. However, in some cases, delays can be useful—to deal with a µP-speed-compatibility issue, for example. The circuit in Figure 1a uses a silicon T/4 delay line and an XOR gate to implement a simple clo. . .  [by Y Li, SAE magnetics (HK) Ltd, Guang Dong Province, China]


Diode Frequency Doublers -  Ordinary fast switching silicon diodes, special fast recovery junction diodes, schottky barrier diodes, varactors and even old-fashioned germanium diodes or vacuum tubes may be used to construct signal powered frequency doublers. . .  [Copyright © 1998 Wenzel Associates, Inc.]


Dither a power converter's operating frequency to reduce peak emissions -  10/13/05  EDN Design Idea   Add a small circuit to spread the peak RFI energy. . .  [by Bob Bell and Grant Smith, National Semiconductor, Phoenix, AZ]


Frequency divider -  Frequency divider with CD4017. . .  [Name of Designer is not included]


Frequency Divider Adapts to I/O Condition -  12/05/96 EDN Design Idea   The circuit in Figure 1 accepts an input clock signal, such as from a crystal oscillator, and divides the frequency according to the input divisor word. You can easily modify the basic design of this versatile PLD-based divider to handle different I/O conditions. The design uses the FLEX8000 family of PLDs from Altera Corp (San Jose, CA). . . .  [by Steve Hranilovic, University of Waterloo, Waterloo, ON, Canada]


Frequency Divider using 7490 Decade Counter -  Here is a low-cost circuit for generating different square-wave signals. The circuit is built around a 10MHz crystal oscillator, hex inverter IC 7404 and seven decade counter ICs 7490. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]


Frequency Doubler Operates On Triangle Wave -  03/14/96 EDN Design Idea   Frequency multipliers typically work with square waves. However, the circuit in Figure 1 performs frequency multiplication on triangle waveforms and maintains the input's amplitude and uniformity. The general idea is to apply the triangle waveform to any full-wave rectifier. The output is then a triangle wave with twice the input frequency plus some dc bias. You then can remove the dc bias using a simple highpass filter or by shifting the bias level with another op Amp. You can continually repeat this trick to obtain a frequency series of 2xFIN, 4xFIN, 8xFIN, and so on. . . .  [by Alexander Belousov, Standard Motor Products, Rego Park, NY]


Frequency multiplier improves line readings -  03/26/98 EDN Design Idea   (Page has several Design Ideas, scroll to find this one)  Because of the low frequencies involved, accurately measuring line-frequency variations is complicated. When you use an ordinary frequency counter with a 1-sec gate time, the reading would be 59, 60, or 61 Hz. To obtain 0. 01-Hz accuracy, you must increase the gate time to 100 sec, a scale that most frequency counters do not offer. Moreover, reading updates are slow with this scale choice. . . .  [by Yongping Xia, Teldata Inc, Los Angeles, CA]


Frequency Tripler using the Ca3028 -  Here is a simple frequency tripler using a CA3028 differential Amplifier. The CA3028 has internal bias resistors for setting the differential Amplifier's current at about 7 mA when connected as shown. With this current, the output level is about 0 dBm at 30 MHz with a 1v p-p, 10 MHz input. . . .  [Copyright © 1998 Wenzel Associates, Inc.]


Gyrator Circuit -  The gyrator principle uses the effect that the value of input capacitance at the base of a transistor is effectively multiplied by the current gain of the transistor. . . .  [Circuit design by Andy Collison]


HCMOS Gates Make Frequency Multipliers -  The rapid edges produced by HCMOS logic ICs are rich in harmonics which can be selectively tuned to make simple frequency multipliers. The desired harmonic may be selected in a number of ways but a few points should be observed. First, the tuning network should not present an excessive capacitive
load to the output of the IC and it is recommended that a series current limiting resistor. . .  [Copyright © 1998 Wenzel Associates, Inc.]


Introduction, definition of terms, Q&Asdoub9-2 -  Application Note. . .  [MiniCircuits.com]


Simple Variable Voltage Source -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency. For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors. . .  [Bill Bowden's circuit]


Two Diode Odd-Order Multiplier -  It is often necessary to multiply the frequency of low noise oscillators without significantly degrading the phase noise beyond the theoretical 20 log (N). Low noise frequency doublers constructed with Schottky signal diodes are readily available but higher-order multipliers often. . . 


Variable Frequency Oscillator -  . . . 


Converters: Frequency Circuits
Converters -- Main Page

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.