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| nr | name | description | manufacturer | 
|---|---|---|---|
| 131 | LM131 | Voltage/Frequency | NS | 
| 2207 | XR2207 | PLL* / VCO | order from Barend | 
| 2207 | XR2207 | Voltage Controlled Oscillator, Data | Exar | 
| 2209 | XR2209 | Voltage-Controlled Oscillator | Exar | 
| 4151 | XR4151 | Voltage-to-Frequency Converter | Exar | 
| 456 | AD456J | CMOS* 10 KHz VCO | AD | 
| 566 | NE566 | VCO | |
| 566 | NE566T | VCO TO5 | |
| 74124 | 74S124 | dual* VCO 60MHz | |
| 74324 | 74LS324 | VCO | |
| 74325 | 74LS325 | dual* VCO | |
| 74326 | 74LS326 | dual* VCO | |
| 74327 | 74LS327 | dual* VCO | |
| 74624 | 74LS624 | VCO 20MHz | |
| 74625 | 74LS625 | dual* VCO | |
| 74626 | 74LS626 | dual* VCO | |
| 74627 | 74LS627 | dual* VCO | |
| 74628 | 74LS628 | VCO | |
| 74629 | 74LS629 | dual* VCO 20MHz | |
| 9400 | TSC9400CJ | F-V | Tel | 
| www.chipcatalog.com/catindex.htm | Very nice! Search the site on www.chipsinfo.com/ | 
| www.freetradezone.com/ | Registration needed | 
| www.icmaster.com/ | Registration needed | 
| www.itis.spb.ru/win/map_eng.htm | Russian site with a lot of component overviews, large parts are in Russian | 
| www.questlink.com/ | Registration is needed before you can download datasheets | 
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