Archive for the ‘Schematics’ Category:

2024-04-20 RCWL-0516 Microwave Doppler Motion Sensor Module Schematic KO4BB

The modules use both the RCWL-9616 and the BISS-0001 but it seems the schematics are all labeled BISS-0001.  The parts values are different.  He gives some good information about them.  They operate at 3.5 and 3.98 GHz – the ones I have were advertised at 5 GHz.  Also he shows his own version that uses a

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2024-04-10 FM Regenerative Receiver Using MPF102 JFET

A basic one transistor regen receiver uses an MPF102 JFET to give the regenerative gain.  Also uses two transistors to amplify the audio to drive an earphone.  How to Build an FM Radio Receiver

2024-03-29 FM Crystal Set Uses Helical Resonator For Tuning

This is a long article but a very interesting project.  It uses HSMS-2850 Schottky detector diodes in a discriminator.  He uses WE 1200 ohm sound powered headphones.  He’s Canadian.

2024-03-10 Radio Shack P-Box List, Assembly Manual, Schematic Info

This seems to be pretty much all of the kits.

2024-03-09 Big Clive’s Old Tungsten Roadwork Beacon – Barricade Flasher

I built this “tungsten roadwork beacon” as Clive calls it, using the parts given in my schematic (photo below). I didn’t have a 6V, 90 mA lamp, so I simulated it by using three 20 ohm, 1/4 Watt resistors in series, which gives 60 ohms and 100 mA load with 6VDC.  For an indicator I

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2024-02-27 MOSFET Driver

The gate driver circuit shown in the screenshot uses BC547s, which are limited to less than 200 mA current.  Instead, if the two transistors were BC337 or PN2222A which can easily handle over 500 mA, they could charge and discharge the gate faster, and thus reduce the dissipation in the MOSFET.

2024-02-21 Website for Electronics – Very Comprehensive

This very comprehensive electronics website has many projects with useful devices.  This example project is a transistor curve tracer.  Go to the index and look at the many, many links.  It seems to be at the ETH in Switzerland but some of the words are in ?Thai?

2024-02-17 BJT, FET Curve Tracer

This very comprehensive website has a transistor and FET Curve tracer.  Also a simpler curve tracer for all components.  Click on box to download the schematic, etc.

2023-12-31 Elektor Audio Compressor – Higher Resolution.PNG

2023-12-07 Halfsterisk Symbol

I had to use white on black background; it should be black on a white background, like paper.

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