Circuits & Schematics Microchip

1. Tiny continuity tester
   David Johnson-Davies
   Circuits Measurement Microcontrollers Usage Microchip ATtiny202
   Figure 1 shows a simple tester, based on an ATtiny202 , a piezo buzzer, and an LED, for checking circuit wiring or tracing out the tracks on a PCB: Figure 1. The Tiny Continuity Tester based on an ATtiny202. The piezo speaker is on the reverse of ...
   Apr 16, 2026
2. 5-V ovens (some assembly required). Part 2
   Nick Cornford
   Circuits Supply Microchip MCP6002
   In the first part ( Reference 1 ) of this Design Idea (DI), we looked at simple ways of keeping critical components at a constant temperature using a linear approach. In this second part, we’ll investigate something PWM-based, which should be ...
   Apr 7, 2026

3. Laser scanning microscope from Blu-ray player
   Doctor Volt
   Circuits Laser Microchip MCP6004
   DIY Laser Scanning Microscope made from a defective Blu-Ray Player. A Blu-ray player must be able to detect the microscopically tiny pits on DVDs in order to play back a film. Therefore, the question arises: Can a Blu-ray player also see other ...
   Apr 1, 2026
4. Newer, shinier DMM RTDs. Part 1
   Nick Cornford
   Circuits Measurement Microchip MCP6002
   This two-part Design Idea (DI) follows on from a couple of previous articles relating to 100-Ω platinum resistance temperature detectors (Pt100 RTDs). The first of those (which we’ll call Ref 1 ) used a simple current-driven bridge to give an ...
   Mar 13, 2026
5. Short push, long push for sequential operation of multiple power supplies
   Jayapal Ramalingam
   Circuits Supply Microcontrollers Usage Microchip ATmega328P
   Industrial systems normally use both analog and digital circuits. While digital circuits include microcontrollers that operate at 5 VDC, analog circuits operate generally at either 12 or 15 VDC. In some systems, it may be necessary to switch on ...
   Feb 4, 2026
6. 5 octave linear(ish)-in-pitch power VCO
   Stephen Woodward
   Circuits Oscillators Microchip MCP602x
   A few months back, frequent DI contributor Nick Cornford showed us some clever circuits using the TDA7052A audio amplifier as a power oscillator. His designs also demonstrate the utility of the 7052’s nifty DC antilog gain control input: ...
   Jan 30, 2026
7. Tuneful track-tracing
   Nick Cornford
   Circuits Measurement Printed Circuit Boards (PCB) Microchip MCP6002
   Another day, another dodgy device. This time, it was the continuity beeper on my second-best DMM. Being bored with just open/short indications, I pondered making something a little more informative. Perhaps it could have an input stage to amplify ...
   Jan 12, 2026
8. Adjustable load
   David Johnson-Davies
   Circuits Measurement Supply Microcontrollers Usage Microchip ATtiny84A
   An adjustable load in Figure 1 provides a constant-current load for testing power supplies and batteries. It allows you to set the load current to up to 1.05 A, using a potentiometer, and displays the current on a three-digit LED display controlled ...
   Dec 14, 2025
9. Rainbow LED indicates voltage with color
   David Prutchi
   Circuits Measurement Microchip PIC12F675
   Meters that indicate analog levels via a moving-pointer meter, a numeric display, or a column of LEDs typically occupy considerable panel area and require more than a casual glance to read. An indicator lamp or LED takes little space but indicates ...
   Jul 28, 2025
10. Power amplifiers that oscillate - deliberately. Part 2 - A crafty conclusion
    Nick Cornford
    Circuits Analogue Design Audio Oscillators Microchip MCP6002 MCP6022
    In the first part ( Ref. 1 ) of this Design Idea (DI), we saw how to use the TDA7052A (or similar) power amp to build a minimalist siren-type power oscillator, and also, having looked at that device’s distortion characteristics under various ...
    Jun 12, 2025

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