Uploaded November 2017 | Updated September 2026, 2 weeks ago
To what distortion level can you adjust the XR2206 function-generator jsut by visually inspecting the waveshape in relation to optimizing via an FFT-spectrum?
The XR2206 has 2 connections for trimming the shape of the sine-wave.
According to the datasheet you can to levels below 0,7%.
How near can you come to the optimum?
The shown function generator ELV FG7001 from 1989 has an interesting concept with a dual-PLL to generate a quartz-stabilized output frequency from the purely analog XR2206.
The first PLL generates a square-wave which feeds the second PLL that finally controls the XR2206 via the FM/Sweep-input.
Some functions of the XR2206 are switched via analog multiplexers(sine/triangle amplitude equalisation) and MOSFETs (capacitor selection for different frequency ranges).
You can download the schematics and description (in German) in a two part PDF for 0,49€ each:
elv.de/Prozessor-Funktionsgenerator-FG-7001-Teil-12/x.aspx/cid_726/detail_34834
elv.de/Prozessor-Funktionsgenerator-FG-7001-Teil-22/x.aspx/cid_726/detail_34840
(If you are from outside Europe just use a fake European adress for registering. You pay via PayPal and get the PDF via email)
To what distortion level can you adjust the XR2206 function-generator jsut by visually inspecting the waveshape in relation to optimizing via an FFT-spectrum?
The XR2206 has 2 connections for trimming the shape of the sine-wave.
According to the datasheet you can to levels below 0,7%.
How near can you come to the optimum?
The shown function generator ELV FG7001 from 1989 has an interesting concept with a dual-PLL to generate a quartz-stabilized output frequency from the purely analog XR2206.
The first PLL generates a square-wave which feeds the second PLL that finally controls the XR2206 via the FM/Sweep-input.
Some functions of the XR2206 are switched via analog multiplexers(sine/triangle amplitude equalisation) and MOSFETs (capacitor selection for different frequency ranges).
You can download the schematics and description (in German) in a two part PDF for 0,49€ each:
elv.de/Prozessor-Funktionsgenerator-FG-7001-Teil-12/x.aspx/cid_726/detail_34834
elv.de/Prozessor-Funktionsgenerator-FG-7001-Teil-22/x.aspx/cid_726/detail_34840
(If you are from outside Europe just use a fake European adress for registering. You pay via PayPal and get the PDF via email)
![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")
