The Wien Bridge Oscillator (sometimes mistakenly misspelled Wein) uses negative feedback to generate a very pure sine wave. The circuit can generate a sine with distortion so low it is difficult to measure. The schematic I´ve attached does not necessarily have such very low distortion, but it is simple – three transistors – and generates
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Q Multiplier experiment in Yahoo group Regenrx2. You heve to join the newsgroup.
This piece of oak serves as a quick way to swap parts for a Joule Thief. I have an air core coil connected to it, and a 3mm white LED which is tired from being used for a few hundred hours. The plus and minus wires are each wrapped around a steel screw and the
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Here’s a screenshot of my DSO with the scope probes across the LED. The pic on the bottom is the actual Joule Thief. The capacitor that is half hidden at the bottom is a 10 uF bypass capacitor.
Some of the most common reasons why a JT doesn’t work are: The windings are incorrectly connected. You can usually fix this by disconnecting ONE winding and swapping the two wires. If you have a fresh battery connected to your non-working JT, measure the voltage at the collector of the transistor. It should be the
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From my watsonseblog dated 2011 Sep 07 2011 Sep 07 LC Meter Model LC100-A In the middle of August I got on eBay and bought a LC meter model LC100-A, which is actually just a PC board, an LCD display, 2 very short clip leads with alligator clips, and a short USB to mini USB
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Clarification: People have asked if the three windings explained in the schematic are in series or parallel. The three are in parallel, in other words, solder three of them together on each end. But make sure you use an ohmmeter to find and separate the other (4th or feedback) winding from the three. In Jan,
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I’ve got several power supplies that I use on my bench or wherever, and I really don’t know why I bought this new one. But It’s getting very close to Xmas and I wanted a present from Santa. I guess I’ll have to explain further to justify my frivolity. Hewlett Packard, AKA Agilent I have
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