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Converters: Frequency Circuits
Converters -- Main Page

Frequency Converter Circuits:  #'s - F       G - Z
 

Last Updated: December 31, 2017 06:47 AM


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

µC Based Performs Frequency Multiplication 27-May-99 EDN-Design Ideas The traditional frequency multiplier requires many elements  a phase comparator to detect the phase error between the input and the output signals, a lowpass filter to convert the phase error__ Circuit Design by Yongping Xia, Teldata Inc, Los Angeles, CA

1-Transistor Amplifier/Detector An amplifier may be added to boost the audio level as shown below.  The current consumption of this amplifier is quite low and a power switch is not included.  Disconnect the battery when the receiver is stored for long periods. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

2-transistor Radio Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive.  Strong stations will provide plenty of volume __ Contact: Charles Wenzel of Wenzel Associates, Inc.

455 Khz MF to AF converter used for DRM reception in a Yaesu FRG-100 receiver Ham RadioV-U)HF AMPLIFIER -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)! __ Designed by Guy Roels ON6MU

5-to-1.8V converter works without magnetICs 04/13/00  EDN-Design Ideas To derive 1.8V from 5V, you might think of using a switch-mode regulator.  Switchers are highly efficient but also complicated and expensive.  Linear regulators, too, are out of the question unless your design can tolerate 40% efficiencies.__ Circuit Design by Dan Christman, Maxim Integrated Products, Sunnyvale, CA

5-to-1.8V Converter Works Without MagnetICs To derive 1.8V from 5V, you might think of using a switch-mode regulator.  Switchers are highly efficient but require inductors.  Linear regulators are simple, but would have only 40% efficiency.  This circuit is more than 70% efficient   (Figure 2a) , sources as much as 100 mA, and uses no inductor[App Note 673]___ Maxim Integrated

750 MHz Power Doubler & Push-Pull CATV Hybird Modules using Gallium Arsenide 3/21/96 App Note  Doc #920 __ California Eastern Laboratories

900-Mhz Down Converter Consumes Little Power 06/22/95 EDN-Design Ideas 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 converter in Fig 1  is nonproprietary and suits battery-powered applications.  Moreover, you can use the IC__ Circuit Design by Ronald Mancini and Raphael Matarazzo, Harris Semiconductor, Melbourne, FL

A 2320 MHz to 144 MHz RX Converter (old) Older designnot recommended, description with schematics for the LNA and the Mixer. __ Designed by Herbert Dingfelder

A 50 MHz to 28 MHz RX Converter Circuit description in English and in German, a picture of the circuit and the schematic diagram. __ Designed by Herbert Dingfelder

A 'Multi-Turn' Homemade Variable Tuning Capacitor A remarkably simple Homebrew device for tuning in your FM stations!  The Radio Shack Special project calls for a typical 6-lead variable tuning capacitor.  This item has to be mail-ordered, as Radio Shack does not carry it.  Should you have trouble finding your variable tuning capacitor for the Radio Shack Special Project, this homemade device can be substituted for it.  In fact, the tuning range for this device is much less critical then the conventional 6-lead variable tuning capacitor...as it has the capability of multi-turns __ Designed by braincambre500 @ yahoo.com

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. __ Designed by Herbert Dingfelder

AC power measurement uses PWM & PAM EDN-Design Ideas 06/17/2015    Use clever pulse modulation techniques to multiply signals and measure power.__ Circuit Design by Adolfo Mondragon

BPF and Mixer SSB Transceiver-Receiver Section:  The signal from the RX/TX relay is filtered by an 80Mtr band pass filter.  This can be replaced by a filter for another band or a bank of switched filters, for a multi band rig.  If you need to cover from 3.5 to 4.0 MHz, you will need to replace the 10p coupling capacitor with one of a larger value   (about 18p).  You can wind your own inductors, about 18 turns on a 10K type Toko former will have 5.5 microhenries of inductance. __ Designed by EI9GQ homebrew radio

Broadband 6 GHz Active Mixer with a Glueless Local Oscillator Interface Equipment Needed, Bullet text, CIRCUIT EVALUATION AND TEST, The control software was used to program the desired LO frequency and the output power.  Figure 9 is a sample screen shot of the software configuration used to drive the ADF4351.  See UG-435 User Guide, Evaluation Board for the ADF4351 Fractional-N PLL Frequency Synthesizer and UG-476 User Guide, PLL Software Installation Guide for further information on setting up the ADF4351___ Analog Devices from the Lab

Charge Pump Doubles Negative Voltage App Note #782___ Maxim Integrated

Clock multiplier circumvents PLL 05/13/99 EDN-Design Ideas Using a standard PLL circuit, such as the CMOS 4046B with some passive components, is a wellknown way to design a clock multiplier.  Unfortunately, using a PLL in a digital circuit has two disadvantages: It takesPDF contains many circuits, scroll to find this one.   [Jose Carlos Cossio, Santander, Spain]circuit has two disadvantages: It takesPDF contains many circuits, scroll to find this one.__ Circuit Design by Jose Carlos Cossio, Santander, Spain

CMOS RF PLL Sythesizer Synthesizer based on available CD4059.  CD4046 and CD4060 ICs. __ Designed by Harry Lythall-SM0VPO

Cockcroft Walton Diode Voltage Multipliers These circuits generate high voltages and can cause dangerous shocks! Do not build these devices unless you are experienced and qualified to work on high voltage devices. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Control Frequency Response & Noise In Broadband, Photodetector, Transimpedance Amplifier EDN-Design Ideas 07/04/96    Converting the current output of a wideband photodetector to a voltage, minimizing noise, and achieving the desired frequency response can tax the patience of even an experienced designer.  Careful selection and correct application of an op amp can often provide the best and most cost-effective solution.  Choosing and properly applying a transimpedance amplifier for broadband photodetector applications involves understanding trade-offs.  Manufacturers of components for wideband transimpedance applications often spec products only for selected detector diodes.  These components can be prohibitively expensive for all but the narrowest applications.__ Circuit Design by Michael Steffes, Burr-Brown Corp

Crystal Radio The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals.  A "cat's whisker" wire contact was moved about the surface of the crystal until a diode junction was formed.  The 1N34A germanium diode. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Crystal Radio RF Amplifier One of the best places to add a transistor to a simple crystal radio is at the front end in the form of an RF amplifier.  The circuit below is a simple but effective amplifier which will give surprising performance improvement.  This amplifier __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Crystal Radio Set Version 2 This uses a more standard ceramic / crystal earpiece and LT44 transformer that you can buy easily.  Look out though, this is a draft version. __ Designed by Henry 

Delay Line implements Clock Doubler 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 clock doubler.  Using a 5-nsec delay unit, a 50- MHz, 50% duty-cycle square-wave input produces a 100-MHz, 50% duty-cycle output clock.  Using a more precise delay line, the circuit can output a triple clock (Figure 1b).__ Circuit Design by Y Li, SAE magnetics  HK Ltd, Guang Dong Province, China7/18/96

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 __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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

Experiments with Detector Diodes When building crystal radios or other simple receivers, the experimenter often wonders about the relative performance of the different diodes in the junk box.  Here are the results of several experiments using the typical. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Frequency divider Frequency divider with CD4017 __

Frequency Divider Adapts to I/O Condition 12/05/96 EDN-Design Ideas The circuit in Figure 1 accepts an input clock signal, such as from a crystal oscillator, and divIdeas 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).__ Circuit Design 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. IC 7490 is...___ Electronics Projects for You

Frequency Doubler Operates On Triangle Wave 03/14/96 EDN-Design Ideas 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.__ Circuit Design by Alexander Belousov, Standard Motor Products, Rego Park, NY

Frequency multiplier improves line readings EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for 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.__ Circuit Design 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. __ Contact: Charles Wenzel of Wenzel Associates, Inc.


Frequency Converter Circuits:  #'s - F       G - Z


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