back to meters and sniffers

voltage to sound:


Use these example circuits to install a meter into a radio that either doesn't have a meter or doesn't have
a GOOD meter. Sound indication can be easier for novice players to use.

Linear response to a logarithmic signal level may not provide a good range of sensitivity.


K1TTT toner


KA6BFB audible s-meter.pdf


LM555 timer applications.pdf (371 KB)

N0ZYC SN74LS124N volt to sound

Tonemeter

vco chip data

2009624221917817	555-vco	audible S-meter

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