RC Notch Filter Twin T:  The twin T notch filter can be used block an unwanted frequency or if placed around an op-amp as a bandpass filter. The notch frequency occurs where the capacitive reactance equals the resistance Xc=R and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated. (added 5/05)

RC Oscillation Circuit:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

RC Receiver hosts two independent Switches:  06/06/96 EDN Design Ideas  / (added 5/05)  Typical inexpensive radio-control (RC) systems have servo-motor outputs, but no on/off switch outputs. You can add two independent RC switches to a system without making any transmitter or receiver modifications.

Rc5 IR Remote Control Transmitter:  In this application note the widely used RC5 coding scheme from Philips will be described and a fully working remote control solution will be presented. This application will use the ATtiny28 AVR microcontroller for this purpose  (Circuit / schematic design added 6/06)

Receive Signal Decoder:  The signal output by the radio control receiver is a form of PWM. This may be useful for driving servos, but is inconvenient for general electronic applications. Therefore, several of the circuits on this site convert this signal into a voltage first. This is performed by this circuit. It is not a project in its own right, just a building block used by other projects.... (Electronic circuit added 4/05)

Remote Switch for radio-Control aircraft accessories:  (Circuit / schematic design added 6/06)

Simplest R/C Circuit:  (Circuit added 9/04)

Tiny RC Cars TX and Charger :  The transmitter runs on only 3V whereas most others run on more voltage. This dirt cheap item uses non-adjustable inductors so it is not possible to tweak for higher output. The common TX2B chip is manufactured by HIGHLAND (SHENZHEN) ELECTRONICS CO LTD and by REALTEK SEMICONDUCTOR CORP and others. (added 2/05)