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Sync Circuits
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Last Updated on: Friday, June 04, 2021 01:53 PM


Circuits Designed by Dave Johnson, P.E.

  • Fully Isolated 50/60Hz Sync Generator
    This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation.

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

Single Gate Synchronizes Clock -  10/27/94 EDN-Design Ideas....The deceptively simple circuit in Fig 1 harbors formidable power. Consider when you have a data-clock input to your system for an existing serial data stream. Then, your system people surprise you.... [Design Idea by Phil Harvey, Technology Integration Inc., Bedford, MA]
Solid-state Relay Saves Battery's Life -  09/01/94 EDN-Design Ideas....The circuit in Fig 1 uses a low-resistance p-channel FET, Q4, to disconnect a load from the battery when the battery's voltage drops below a certain value. After you disconnect the circuit, it remains off until you remove and replace the battery.... [Design Idea by Tom Gay, Siemens, Regensburg, Germany]
 
Sync Tip Clamping -  10/08/98 EDN-Design Idea  In digital sync-tip clamping, a stand-alone "clamping" ADC (CADC] incorporates the dc-restore function at its input and eliminates the need for external timing strobes.  This technique encompasses a complete front-end architecture, including sync detection and automatic gain control (AGC] and provides.... [Design Idea by Lazar Shifrin, Advanced Imaging Solutions]
Synchronized Timing Generators  -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
Synchronized Window Comparator Eliminates Error -  05/11/95 EDN-Design Ideas....Precision A/D converters need a window comparator. The window comparator in Fig 1a is synchronized to the clock signal.  This synchronization eliminates errors that could arise when the input signal crosses the high or low threshold (Fig 1b]unsynchronized to clock. In operation, comparator IC1A sets flip-flop IC2.... [Design Idea by Sergey Velichko, Consultant, Bosie, ID]
Synchronizing Controller detects baud rate -  03/02/98 EDN-Design Ideas....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].…File contains many circuits, please scroll to find this one.... [Design Idea by William Grill, Riverhead Systems, Littleton, CO]
Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers -  AN-587-Analog Device Application Notes....[App Note]  
Synchronizing Multiple AD9852 DDS-Based Synthesizers -  AN-605-Analog Device Application Notes....[App Note]  
Synchronous buck circuit produces negative voltage -  6-Mar-03 Issue of EDN  Many electronic systems require both positive and negative voltages to operate properly. Generating an efficient, low-voltage positive output from a higher voltage input typically entails the use of a synchronous buck regulator. But when generating a negative output voltage from a positive input voltage, you'd typically use a flyback topology, especially at higher output currents.... [Design Idea by John Betten, Texas Instruments, Dallas, TX]
Synchronous flyback circuit provides high-efficiency conversion -  22-Jul-04 Issue of EDN  Buck regulators are usually the first choice when you design nonisolated step-down regulators unless the ratio of VIN to VOUT is greater than 10, the input voltage is high, or both. Low duty cycle can be problematic for FET drivers and cause current-mode control loops to lose control. Efficiency can fall dramatically to 60 to 70% at low VOUT and current of only a few amps.... [Design Idea by Wayne Rewinkel, National Semiconductor, Phoenix, AZ]
Synchronous oscillator converts audio video to FM -  07/22/99 EDN-Design Ideas....The synchronous oscillator (SO) and the coherent phase-locked synchronous oscillator (CPSO) are universal multifunctional networks that track, synchronize, and amplify as much as 80 dB; improve SNR by as much as 70 dB; and modulate AM, FM, and FSK signals.... [Design Idea by Vasil Uzunoglu, Synchtrack, Gaithersburg, MD]
Synthesize Optimal Digital Frequency Dividers -  05/13/99 EDN-Design Ideas....For many applications, you need to divide a reference clock into one or more subclocks to use in different parts of the system. Sometimes,....PDF contains many circuits, scroll to find this one.…[Lindo St Angel, PrairieComm Inc, Arlington Heights, IL] [Design Idea by Lindo St Angel, PrairieComm Inc, Arlington Heights, IL]
TV/Radio Antenna Cable galvanic isolator -  A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system.  This type of ground loop problem can be solved by using suitable isolation between your AV system and the antenna cable. The simplest way to get rid of the hum is to disconnect the antenna cable from the AV system. If you still want to watch cabe TV or listen to your radio an keep the system hum free then you have to install isolators to all those antenna cable connections your system has.... [Circuit design by Tomi Engdahl]
Two AA cells power step-down regulator -  01/07/99 Issue of EDN  DC/DC conversion is particularly challenging when both the input and output voltages are low. Step-up ICs that operate with inputs lower than 1V are available, but step-down ICs that accept input voltages....Page includes several designs.  Scroll to find this one.... [Design Idea by Len Sherman, Maxim Integrated Products, Sunnyvale, CA]
Video Amplifier with Sync Stripper & PC Restore -  This document is an application note of200 MHz video amplifier, sync stripper and DC restorer in PDF format. (app note added 5/02)
Video Difference Amplifier Brings Versatility to Low Voltage Applications -  DN343  Design Notes (Linear Technology) (app note added 1/06)

Sync Circuits#'s - M       N - Z


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