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. Author manuscript; available in PMC: 2014 Apr 29.
Published in final edited form as: ACM J Emerg Technol Comput Syst. 2012 Jun 1;8(2):8. doi: 10.1145/2180878.2180880

Fig. 2.

Fig. 2

Two Implantable telemetry circuits of the era of 1960. (a) Mackay–Blocking Oscillator, 1958 [Mackay 1959]; (b) Ko–Tunnel Diode Telemetry Unit, 1961 [Ko and Neuman 1965]. © Wen Ko, 2012.