The above simple circuit is to be used to control several relays that will do all the "hard work" as in heavy current switching. It is advised to select a relay that is rated larger in current carrying capacity than you actually need for long term reliability. Please note that the relays are directly switched via the switches within the joystick, this concept was chosen for simplicity. For relays that require currents over 50 milli Amps, please use "circuit 2" utilising transistors to perform the switching of the relays.
The above simple transistorised circuit is to be used to control several relays that will do all the "hard work" as in heavy current switching. It is advised to select a relay that is rated larger in current carrying capacity than you actually need for long term reliability. Please note that the relays are directly switched via the transistors Q1 - Q8 on a PCB in a circuit box external to the joystick. This concept was chosen for its utter simplicity being powered by 12 Volts (eg: a Gel cell as used in alarms etc.) Note clamping diodes. The relays 1 - 8 (ie: if all 8 are used) have on currents around 120 milli Amps thus switching of the relays to handle the current
Disclaimer: Whilst every effort is made to ensure the accuracy of this circuit, there will be some out there who will use it and do it wrong, thus destroying their equipment. We do not make any warranties regarding this circuit, it is to be used as a "guide only" and you alone must determine if it is suitable for "your expertise". We cannot, nor will not be responsible for any errors or omissions or accidents made in using this circuit. The circuit was devised here at Unitech, kept as simple and as functionally possible for all folks to use. All circuits contained on the Unitech Electronics web site are "as is" and no warranty regarding accuracy and function ability or suitable to your purpose or application is made what-so-ever. Use at your own risk. This equipment must not be used in a "life support" situation whereas the dependence on it is "life-critical".
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