Caution Note

The circuits are intended for someone with experience in electronics and who is willing to experiment. I tried to keep things as simple as possible. The circuits therefore do not have much built-in protection and the user is advised to observe due caution. Here are some of the things to note:

Always use a regulated power supply with current limiting for testing, or a battery fitted with a fuse.
If you are using a transmitter-receiver set-up, always switch on the transmitter first. After the transmitter, you can switch on the receiver and other circuits. On power down, go in reverse, first switch off the circuits and the receiver, than finally the transmitter.
When first testing circuits, put a dummy load instead of the motor (where applicable).
If you are trying a motor, make sure it is clamped securely.
Some power circuits can get hot. Do not accidentally burn yourself.
Build complex circuits one module at a time, testing each part separately.
Use the correct tools and instruments.
Try each circuit on the workbench first and see that it works reliably, only then install it in a model.
The author is not responsible for any use or misuse of the ideas in these documents.