Archive for the ‘Building projects and kits’ Category:

2024-05-16 Delta-Sigma Modulator Using 555 IC And Current Source

This circuit is used for converting an analog signal into a digital pulse stream.  Such things as class D audio amplifiers, servo amplifiers, A to D converters, or sending an analog signal across a fiber optic link. The Schematic and explanation here in this webpage. The output signal is shown as audio modulated onto

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2024-05-13 Autonomous Solar Tracking System

For each direction of travel, it consists of two solar cells connected in parallel opposing to a motor that’s geared down to turn the tracking so both solar cells are in the shade.

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

2024-03-30 MX20T Link Switch Port Tester

A long time ago when we were going to Cat5 UTP, I had a lot of these MX20Ts left over.  So I made up a 15 pin plug with the negative 9VDC on pin 6 and positive on pin 13, and soldered the wires to the battery contacts.  I taped the battery to the back

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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.

2024-03-24 Signal Distortion From High-K Ceramic Capacitors

A good article about signal distortion in a Butterworth low pass opamp filter using C0G and X7R MLCCs.

2024-03-22 USB Power Delivery Trigger Adapter

Some important information for those who wish to power their projects with a USB C “power delivery” adapter.  You may need one of these. This is a YouTube short video.

2024-03-11 Flexible LED Filaments

Some information on what current and resistors to use.  The LEDs are all in parallel and need about 3 Volts, current limited with a resistor.

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

This seems to be pretty much all of the kits.

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