Diode Frequency Doublers - Ordinary fast switching silicon diodes,
special fast recovery junction diodes, schottky barrier diodes,
varactors and even old-fashioned germanium diodes or vacuum tubes may be
used to construct signal powered frequency doublers.....(electronic
circuit)
Gyrator Circuit - The gyrator principle uses the effect that the
value of input capacitance at the base of a transistor is effectively
multiplied by the current gain of the transistor.
Simple Variable Voltage Source - The high current regulator below
uses an additional winding or a separate transformer to supply power for
the LM317 regulator so that the pass transistors can operate closer to
saturation and improve efficiency. For good efficiency the voltage at
the collectors of the two parallel 2N3055 pass transistors
Two Diode Odd-Order Multiplier - It is often necessary to multiply
the frequency of low noise oscillators without significantly degrading
the phase noise beyond the theoretical 20 log (N). Low noise frequency
doublers constructed with Schottky signal diodes are readily available
but higher-order multipliers often..
