Various Schematics and Diagrams


Posted on Feb 6, 2014

Even the energy storage capacitors in even the smallest disposable camera flash operating from a 1. 5 V AA battery can be deadly under the wrong conditions. Line powered devices - even little ones - may have an added danger of high power at high voltage AND are often non-isolated (no power transformer). Do not attempt to troubleshoot, repair, or modify such equipment without understanding and following ALL of the relevant safety guidelines for high voltage and/or line connected electrical and electronic systems. Before thinking about experimenting with anything using or producing high voltages or connected to the AC line - even opening up a disposable camera that may have been laying around gathering dust (the capacitor can still be charged - outch!), see the document: Safety Guidelines for High Voltage and/or Line Powered Equipment. Something that looks innocent can really ruin your entire day! Perhaps the larges collection of all sorts of on-line schematics and links in the explored universe can be found Tomi Engdahl`s Lights and Electronics Page. There are many other documents at the Sci. Electronics. Repair (S. E. R) FAQ Web site or one of its mirror sites which may be of use in the design, testing, and repair of electronic equipment. The Main Table of Contents (ToC) provides links to a variety of information on troubleshooting and repair of many types of equipment, general electronics, an assortment of schematics, over 1, 000 technology links, and much more. Most of these documents are nicely formatted, indexed, and cross-referenced. ( Silicon Sam`s Technology Resource, which may be present at this site and others, usually contains slightly more recent versions of many of these same documents but most of those under the S. E. R FAQ Main ToC are easier to use and the actual content differences are likely to be minor. ) This basic circuit is capable of supplying up to 30 kilovolts or more from a low voltage DC source using a flyback (LOPT) transformer salvaged from a TV or computer monitor. Typical output with a 12 VDC 2 A power supply or battery will be around 12, 000 V. Current at full voltage is typically around 1 to 2 mA. Higher currents are available but the output voltage will drop. At 2 kV, more than 10 mA may be possible depending on your particular flyback transformer. This circuit uses a pair of 555 timers to provide variable frequency variable pulse width drive to an inverter using a flyback transformer salvaged from a black and white or color TV or computer monitor. The input voltage can range from about 5 to 24 V. Using a flyback from a MAC Plus


Various Schematics and Diagrams
Click here to download the full size of the above Circuit.




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