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Dual-frequency (simultaneous dual resonance) analog sine wave gen with 1 op-amp?

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duak:
In the early 70's the local telco was throwing out some stuff and I recall getting a manual that had a schematic similar to the above DTMF generator.   So, even in 1967 (from a schematic on the above website) it was cheaper to use one transistor, two DIACs and two custom multitapped transformers?  I guess they were tooled up and the circuit worked so why mess with success?

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