A lot of small Circuits can be built for RC Model DIY. Here is a small collection of them

Here you will find Schematic Circuit Diagram for DIY and further information on RC Model Circuits
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Small Downed Model Locator	http://www.electronics-lab.com/projects/models/003/
Mosfet RC Model Motor Control	ww1.microchip.com/downloads/en/AppNotes/00847a.pdf
Several Circuits, Motor Control, Servo tester, Charger	www.klaus-leidinger.de/mp/index.html
Sophisticated Telemetry Project with altitude Sensor MPXS410	www.electronic-engineering.ch/microchip/projects/alti/alti.html