555 Makes handy Voltagetotime Converter: 02/01/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

900MHz Down Converter Consumes Little Power: 06/22/95 EDN-Design Ideas

Analog Tachometer for Gasoline Engines:

Circuit Converts Pulse Width to Voltage #2: 10/28/99 EDN-Design Ideas / The circuit is optimized for a positive-going pulse width of1 to2 msec, repeating at intervals of approximately17 msec. The output produces a voltage of0.95V for a1-msec pulse to2.25V for a2-msec pulse.

Circuit converts pulse width to voltage: 10/25/2001 EDN - Design Ideas / The circuit in Figure 1 converts pulse information to a clean dc voltage by the end of a single incoming pulse. In another technique, an RC filter can convert a PWM signal to an averaged dc voltage, but this method is slow in responding. Converting low-duty-cycle pulse information is slower yet. .

Diode Frequency Doublers:

Frequency Doubler operates on Triangle Waves: 03/14/96 EDN-Design Ideas

Frequency Multiplier Improves Line Readings: 03/26/98 EDN-Design Ideas

Frequency to Voltage Converter uses Sample & Hold to Improve Response & Ripple: National Semiconductor Application Notes,28-Jun-1996

Frequency Tripler Using the CA3028:

Gyrator Circuit: The gyrator principle uses the effect that the value of input capacitance at the base of a transitor is effectively multiplied by the current gain of the transistor.

HCMOS Gates Make Frequency Multipliers:

Hear Amateurs on your FM Radio!:

LF to HF Converter:

LM2907 Tachometer / Speed Switch Building Block Applications: National Semiconductor Application Notes,04-Nov-1995

New Phase Locked Loops:

Non Powered Ring Modulator Circuit:

Short Wave Converter for Scanners:

tw1o Diode Odd Order Multiplier:

Volt / F Converter ICs Handle Frequency to Voltage Needs: 09/28/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit