2019-09-30 RF Modulator

For the oscillator I used the Hartley oscillator circuit that is used in the Eico 330 signal generator. I didn’t need any of the range switches – I left that out. It used MPS6513 transistors which are cheap but very uncommon – I can’t remember ever seeing them in any schematics or in PC boards. The Eico 330 stages were designed for a 77 MHz bandwidth, which my signal generator doesn’t need. So the circuit looks much simpler.

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