Abstract: Apparatus for producing vibrato has several analog shift registers with at least 2.sup.9 stages whose inputs receive tone signals from an electronic musical device such as an organ or guitar and are connected to each other. The outputs of the shift registers are connected to a common amplifier. Each shift register receives tone signal transporting pulses from a discrete voltage-controlled high-frequency oscillator, and the inputs of the high-frequency oscillators receive control signals from discrete voltage-controlled low-frequency oscillators whose outputs transmit variable-frequency signals. The output signals of the low-frequency oscillators have different frequencies and are out of phase with respect to each other.

Abstract: A throttle governor/collective pitch control apparatus for radio controlled model helicopters for proportionally controlling either the model helicopter rotor speed or the rotor collective pitch, including sensing and timing means determining the rotor speed and any changes thereof, comparison means for comparing a subsequently sensed rotor speed with a first sensed rotor speed and developing an error signal, and control means responsive to the error signal to provide a control signal proportional to any changes in the rotor speed. In the throttle governor mode any variations in rotor speed result in a proportional control signal to vary the model helicopter throttle so as to maintain constant rotor speed. In the auto-collective mode changes in rotor speed result in a proportional control signal coupled to the collective pitch servo for proportionally varying the model helicopter collective pitch.

Abstract: A control circuit for controlling an automatic rhythm generating circuit of an automatic rhythm performance apparatus comprises a memory for controlling the rhythm start or stop operation of the automatic rhythm generating circuit by an output state, a rhythm performance control signal supply circuit including a plurality of rhythm performance control switches, and a logic circuit having inputs coupled to the outputs of the rhythm performance control signal supply circuit and to the outputs of the memory and having outputs coupled to the inputs of the memory. The state of signals at the outputs of the rhythm performance control signal supply circuit is variable by the operation of the control switches. The logic circuit causes the memory to be set from one output state to another state in response to a variation in the state of signals at the outputs of the rhythm performance control signal supply circuit.