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Stefan Dzisiewski-Smith on Muck Rack

Stefan Dzisiewski-Smith

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Articles by Stefan Dzisiewski-Smith

Alternatives to screw terminals, breadboards for prototypes?

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By Ignacio Vazquez-Abrams, Stefan Dzisiewski-Smith
| stackexchange.com
I like screwless terminals: Wago 2060 series: Wago 233 series: These just require a simple push down of a screwdriver to insert or remove cable. For easy-to-make cable, IDC ribbon connectors are nice, as you don't have to strip the cable, just insert it into the connector and compress gently with a vice. Alternatively if you don't mind screwing the terminals in once, but then want easy disconnect / reconnect, try pluggable terminal blocks: These are also available in screwless types.
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If an FM signal has different frequencies, how does the radio receive the signal in a fixed frequency?

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By Andy aka, Wouter van Ooijen, Yasir Mohamed, Stefan Dzisiewski-Smith
| stackexchange.com
The frequency you tune to is the centre frequency of the spectrum created by the modulation. The input from the aerial is generally modulated down to an intermediate frequency (to make it easier to work with) and then fed into a Phase-Locked Loop (PLL) circuit which creates a signal proportional to the frequency shift from the centre frequency. This signal turns out to be the originally encoded audio (if you work through the maths).
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