Help With Schematic-biomedical

Zarcon

14th January 2008 - 02:57 AM

Need help with a schematic. DPDT (center off) switch is used to send one of 2 signals to laboratory animal.
1: Nerve stimulus 0.5-4.0 ma at 3-5 volts
2: Radiofrequency signal at 1.7 mhz

Cannot tap into RF power source, however nerve stim has 9 volt dc battery.

Would prefer to use separate battery supply, size/space is not a significant factor.

Cannot use 120 v ac supply (or converted) due to safety.

How should I wire panel indicator lights (?LEDs) to indicate that circuit 1 or circuit 2 is active? Should this be done with a relay? LED's.
Need to be sure that none of the indicator circuit voltage is allowed to intermingle with either of the other 2 circuits.

Appreciate your help I am a beginner at this type project.

Thanks

Chuck

fizzeksman

14th January 2008 - 06:01 AM

Hi Zarcon

Use one pole either side (opposite in relation to throw) to complete a series circuit to power the appropriate led... this can be powered by a separate battery if desired.... and use the remaining pole on either side to complete a series circuit to activate the working circuits. You will need an appropriate battery powered relay wired in series through the switch to activate the hf side of the ciruit.

Jack

PhysOrg scientific forums are totally dedicated to science, physics, and technology. Besides topical forums such as nanotechnology, quantum physics, silicon and III-V technology, applied physics, materials, space and others, you can also join our news and publications discussions. We also provide an off-topic forum category. If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day.