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Function generator chips such as the venerable XR2206 and ICL8038 are now considered fairly old and slow, but are still useful for some things. Something newer such as a MAX083 which can reach 20 MHZ looks a lot more promising. www.dieel ektroniker seite.de/D atasheets/ Sonstiges/ MAX038%20(Maxim).pdf-Star Wars Force Trainer - The prequel to the FT II, and apparently, just like the movies, the prequel sucks. It has been discontinued a while back. However, you can still get some on Amazon -- AT 300 BUCKS. Ultracortex "Mark IV" - Looks fancy with all those electrodes. Probably more accurate than anything NeuroSky makes. Datasheet RL78/G12 RENESAS MCU True Low Power Platform (as low as 63 μA/MHz), 1.8V to 5.5V operation, 2 to 16 Kbyte Flash, 31 DMIPS at 24MHz, for General Purpose Applications ICL8038 <- Usamos esse. XR2206. MAX038. Mas veja lá a especificação se algum te atende, temo que não. Vão até 10MHz. Agora, se vc quer gerar uma senoide ou onda quadrada de 20MHz exatos é simples. Vc pode por pra oscilar um cristal de 20MHz com um integrado CD4060, que já tem o circuito para oscilador.With excellent performance ASIC chip function generator ICL8038, add a small amount of resistive and capacitive components, can produce sine, triangle and square wave, and the frequency of the signal, duty cycle, adjustable distortion sine wave.