Uploaded November 2016 | Updated September 2026, 1 week ago
Crystal- or Piezo-Earpieces are today only used for crystal-radios because they claim to have high sensitivity and present only a negligible load of over 10 Mohms.
Well can this really be true?
Roger tells the truth about the real impedance or load-resistance of crystal earpieces.
Forum: forum.kainkalabs.com/forumdisplay.php?fid=3
Shop: ak-modul-bus.de
twitter: twitter.com/kainkalabs
facebook: facebook.com/kainkalabs
Crystal- or Piezo-Earpieces are today only used for crystal-radios because they claim to have high sensitivity and present only a negligible load of over 10 Mohms.
Well can this really be true?
Roger tells the truth about the real impedance or load-resistance of crystal earpieces.
Forum: forum.kainkalabs.com/forumdisplay.php?fid=3
Shop: ak-modul-bus.de
twitter: twitter.com/kainkalabs
facebook: facebook.com/kainkalabs
![Every Maker Should have...[Pt.39]...a Solder-Iron Thermometer](https://i.ytimg.com/vi/yLrHQyJil58/mqdefault.jpg "Every Maker Should have...[Pt.39]...a Solder-Iron Thermometer
A surprisingly accurate, cheap and user-friendly Chinese solder-iron thermometer. Also resold by HAKKO :-)
Support Roger on Patreon: https://www.patreon.com/kainkalabs
Very useful if you have a solder-station/solder-iron of unknown quality to check the true temperature at the solder-tip.
For the FG-100 there are also temperature-probes for solder-pots and for hot-air stations available.
Furthermore a teardown of the FG-100 & comparison with the ELV LTT1 and a normal thermocouple thermometer.
Link to the ELV LTT1:
https://www.elv.de/L%C3%B6tkolbentemperatur-Messger%C3%A4t-LTT-1/x.aspx/cid_726/detail_31395")
![Every Maker should have...[Pt.37]...a Rubidium Frequency Standard](https://i.ytimg.com/vi/zW5ffFuEQsw/mqdefault.jpg "Every Maker should have...[Pt.37]...a Rubidium Frequency Standard
Nowadays yu can easily build your own Rubidium Frequency-Standard with 9 digits precision.
Support Roger on Patreon: https://www.patreon.com/kainkalabs
You need for adjusting your frequency counter and quartz-controlled clocks.
Some demos and a look inside.
Type: EFRATOM LPRO-101
David L. Jones Videos about what´s inside the black box of a rubidium frequency standard and how it works:
http://www.youtube.com/watch?v=I55uLRRvLCU
http://www.youtube.com/watch?v=FRdGsSu5Nec
IN-17 miniature Nixie-clock:
https://www.kosbo.com/clocks/in-17-nixie-clock.html")
