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Practical Electronics January 2022

Projects and Circuits:
Vintage Battery Radio Li-ion Power Supply;
Vintage Radio 'A' and 'B' batteries have been unobtainable for some time. This compact and easy-to-build module uses Li-ion or LiPo cells.

The MiniHeart;
Give a favourite soft toy a beating heart! With both a soft sound and a real beat, it could relax a baby, a puppy - or even help you sleep better!

Balanced Input and Attenuator for the USB SuperCodec - Part 2;
As described last month (Dec 21), this add-on board for the USB SuperCodec provides two balanced inputs and fits in the same instrument case - now let's build it!

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Series, Features and Columns:

Audio Out;
Analogue Vocoder - Part 3: Driver Amplifier

Flowcode Graphical Programming;
Redboard and PICs - Part 1

Circuit Surgery;
Op AMP Logarithmic and Exponential Amplifiers - Part 2

PIC 'n' Mix;
Part 9: PIC18F Development Board

Make it with Micromite;
Part 32: Using iButtons with the Micromite.