Hello, AAC forum!
I have been thinking about how to do this for a while. How can I bring power and connections to a circuit that lies within a shield enclosure? Naturally, without rendering the beneficial effects of the shield useless in the process.
The optimal way would of course be to use shielded wires, but this is not always possible due to cost. As a real example, let's use the circuit I am currently attempting to build, and which forced me to look harder at this problem. The circuit is in short a relatively high gain (~40V/V) band-pass amplifier (with some other active components, not so important), connected to a silicon-based photon detector. The circuit is very susceptible to noise. Unfortunately for me, the band pass is smack middle in the FM broadcast radio frequency spectrum so I worry I may pick this up from my local radio tower. I have decided to keep the entire circuit within an enclosure so as to minimize the amount of cables that need to pass through the enclosure. The bare minimum is however:
Regards, Pinks
EDIT: I see now I posted this in a different subforum than I intended. This thread was meant for "general electronics chat".
I have been thinking about how to do this for a while. How can I bring power and connections to a circuit that lies within a shield enclosure? Naturally, without rendering the beneficial effects of the shield useless in the process.
The optimal way would of course be to use shielded wires, but this is not always possible due to cost. As a real example, let's use the circuit I am currently attempting to build, and which forced me to look harder at this problem. The circuit is in short a relatively high gain (~40V/V) band-pass amplifier (with some other active components, not so important), connected to a silicon-based photon detector. The circuit is very susceptible to noise. Unfortunately for me, the band pass is smack middle in the FM broadcast radio frequency spectrum so I worry I may pick this up from my local radio tower. I have decided to keep the entire circuit within an enclosure so as to minimize the amount of cables that need to pass through the enclosure. The bare minimum is however:
- SPI communication wires
- Positive and negative power supply (20-30V) + ground return
- -56V bias for the detector + ground return
Regards, Pinks
EDIT: I see now I posted this in a different subforum than I intended. This thread was meant for "general electronics chat".