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Relay Circuits, Page 4b
Relay Circuits:  #'s - B        C - H        I - O        P - S        T - Z
Last Updated on:
Thursday, December 07, 2017 02:04 PM


Circuits Designed by Dave Johnson, P.E. :
  • SOLID STATE RELAY REQUIRES ONLY 50uA DRIVE CURRENT
    This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery powered systems. Using a combination of a high current triac and a very sensitive low current SCR, the circuit can control about 600 watts of power to load while providing full isolation and transient protection.

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

SCR phase control yields solid-state switch -  03/15/01 EDN-Design Ideas....SCRs (silicon-controlled rectifiers]/ PDF contains multiple circuits scroll to find the one of interest, or thyristors, have higher current ... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Simple Circuit Drives Latching Relays -  02/01/96 EDN-Design Ideas....Figure 1 shows a low-parts-count circuit that can drive one- or two-coil latching relays. Latching relays are useful in sensitive analog designs. The 74ACT174 hex flip-flop has ample capability to drive the Aromat TQ2E.... [Design Idea by Roy McCammon, 3M Austin, TX]
Simple Solenoid Driver Reduces Power & Cost -  07/18/96 EDN-Design Ideas.... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
Smartcard-controlled Relay -  From a designer's perspective, there are no "good" or "bad" circuits.  This article will show how to transform a "pirate" smart card (cheaply available almost everywhere nowadays , as consequence of digital TV piracy plague)...
Soft-Start Circuit For Power Amps -  Although the soft start circuit can be added to any sized transformer, the winding resistance of 300VA and smaller transformers is generally sufficient to prevent a massive surge current. Use of a soft start circuit is definitely recommended for 500VA and larger transformers.... [Rod Elliott (ESP)]
Solenoid Starter -  (electronic schematic / circuit added 4/02)
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Solenoid trip circuit works at battery's end of life -  8-Jul-04 Issue of EDN This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in the original design worked fine as long as the battery was fresh but failed as the battery got into the middle of its life, even though suf.... [Design Idea by Brad Peeters, Theta Engineering, Costa Mesa, CA]
Solid State Relay Requires only 50uA Drive Current -  This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery powered systems. Using a combination of a high current triac and a very sensitive low current SCR, the circuit can control about 600 watts of power to load while providing full isolation and transient protection. Published in Electronic Design, Dec 2, 1996. …. [Designed by David A. Johnson]
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]
Solidstate Remote Control Switch -  Circuit / schematic (added 02/05)
Solid-State Tesla Coil, #1 -  Nikola Tesla is considered by some to be the greatest inventor of our modern electrical age, and many experts consider him to be the true father of radio. However, today he is best remembered for his fascinating wireless power-transmission experiments, using his famous Tesla Coil.  The high-frequency air-core, oscillating Tesla Coil is just as exciting today as it was back in 1899.... [rewritten by Tony van Roon]
Solid-State Tesla Coil, #2 -  Tesla coils have been around for almost 100 years and, with th exception of vacuum-tube driven coils, not much has changed from the way Nikola Tesla invented them.  This article describes a new type of Tesla coil: a true solid-state Tesla coil. One thing that makes our Tesla coil unusual is that the coupling to the secondary coil is by a direct electrical connection rather than by magnetic fields.... [rewritten by Tony van Roon]
Square Tesla Coil -  Figure 1 shows the schematic diagram of the Tesla Coil circuit. The circuit consists of little more than a few coils, a step-up power transformer, and a capacitor. Power from an AC wall receptacle is fed to transformer T1 (a small neon-sign transformer) which steps the voltage up to about 3000-volts AC.…. [Tony van Roon's circuit]
Switch Intelligently Controls Current -  03/30/00 EDN-Design IdeasThis circuit can intelligently control ac or dc current when connected in series with a load..…PDF contains many circuits, please scroll to find this one… [Design Idea by Jim Hartmann, Silent Knight LLC, Maple Grove, MN]
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Relay Circuits:  #'s - B        C - H        I - O        P - S        T - Z


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