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- Aug 8, 2016
- 15
- Joined
- Aug 8, 2016
- Messages
- 15
Hi there. I am hoping someone can help me with a project. I acquired an old underwater camera that was used on ROV's in the oil and gas industry. I need to make some sort of tethered triggering device that will allow me to trigger the camera shutter from the surface of the water. I have an underwater cable that connects to the correct terminal on the camera itself. Originally this cable would have attached to the ROV directly and the camera shutter would have been triggered through the ROV remote control.
Here are the technical details from the manual re: the shutter:
3.1.3 SHUTTER
When the trigger input line is pulled down, the bistable latch comprised of cross coupled nand gates is set resulting in the positive excursion of the input to monostable IC2. This monostable produces a positive pulse on pin 6 of IC2. This in turn turns on the shutter drive transistor effectively connecting the shutter solenoid across the 3300 microfarad capacitor C2 which has been charged to 16 volts. As the capacitor discharges, the solenoid current decreases down to a steady state value determined by its series connections with 2.7 ohm resistor, the drive transistor, and the two IN5392 diodes.
As the shutter solenoid operates, the shutter contacts close, firing the sronge and also resetting the monostable via pin 3. Because of the short time taken to operate the contacts, the monostable's nominal 50 ms output pulse is shortened to approximately 15 ms by the reset of action on pin 3 of IC2.
I have no real experience with electronics and would appreciate any insight or suggestions. The trigger will be operated high and dry from a boat. It could take any form- a button, plunger, etc. It doesn't need to be pretty just functional.
Thanks in advance,
Chris
Here are the technical details from the manual re: the shutter:
3.1.3 SHUTTER
When the trigger input line is pulled down, the bistable latch comprised of cross coupled nand gates is set resulting in the positive excursion of the input to monostable IC2. This monostable produces a positive pulse on pin 6 of IC2. This in turn turns on the shutter drive transistor effectively connecting the shutter solenoid across the 3300 microfarad capacitor C2 which has been charged to 16 volts. As the capacitor discharges, the solenoid current decreases down to a steady state value determined by its series connections with 2.7 ohm resistor, the drive transistor, and the two IN5392 diodes.
As the shutter solenoid operates, the shutter contacts close, firing the sronge and also resetting the monostable via pin 3. Because of the short time taken to operate the contacts, the monostable's nominal 50 ms output pulse is shortened to approximately 15 ms by the reset of action on pin 3 of IC2.
I have no real experience with electronics and would appreciate any insight or suggestions. The trigger will be operated high and dry from a boat. It could take any form- a button, plunger, etc. It doesn't need to be pretty just functional.
Thanks in advance,
Chris