My recent two blogs on powering a flasher with four red LEDs used a flasher made by modifying a Joule Thief. It works fine, but it requires a toroid core and wire; the flasher I blogged earlier does not require any inductor. It is a switched capacitor or charge pump,. and it works okay with
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One Joule Thief I have not built (at least not in the same JT) is the low power JT with the CdS photocell. Almost all of my JTs with daylight shutoff used a LED as a light sensing diode, and then most were flashers. I have a bunch of CdS photocells but I haven’t really
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A common circuit such as a night light may use a CdS photocell to turn it off during daylight hours and on during night time. The photocell is connected to a circuit that senses the voltage and turns the rest of the circuit on and off at a threshold point. The photocell is in series
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I’ve thought about this a number of times in the recent past. There used to be a .ZIP file on the ‘netcalled Xanadu Zapper which consisted of plans and code to implement an IR xmit/recv interface for the PC along with code for learning and sending the IR codes. Many years ago I built the
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I pulled these Siemens DL 2416 from an old PBX. They are seated into an 18 pin right angle adapter that reduces the size down to the standard 0.3 inch wide pattern. I found the datasheet for these online. Each character of the four character display consists of small segments of red LEDs. There is
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