Timeline for Pre-amplifier input protection
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Sep 10, 2021 at 16:52 | comment | added | Abdul Wahid | Search BAV 23s diodes.... | |
| Mar 29, 2019 at 14:05 | history | edited | Geoff | CC BY-SA 4.0 |
added 184 characters in body
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| Mar 29, 2019 at 13:21 | comment | added | Geoff | Thank you for clarifying the reason for the low maximum input. If I have read the data sheet for the LM358 correctly, it confirms that the maximum input signal voltage range is -0.3 to +32 volt. | |
| Mar 28, 2019 at 2:40 | comment | added | user207421 | The maximum input is specified as 40mV because the gain is up to 100 and the minimum Vcc is specified as 10V, giving you 5V peak output, or 3.5VRMS, so 40mVRMS roughly defines a clipping point rather than the damage point. A much larger input won't damage the first op-amp, up to at least the voltage rail. | |
| Mar 28, 2019 at 1:55 | history | became hot network question | |||
| Mar 28, 2019 at 0:35 | answer | added | Justme | timeline score: 4 | |
| Mar 27, 2019 at 23:32 | answer | added | DrMoishe Pippik | timeline score: 3 | |
| Mar 27, 2019 at 22:55 | comment | added | DKNguyen | Normally you would clamp to the maximum that the input can take, not the expected maximum of the signal source. It is likely that the 40mV maximum is the maximum that the amp can take and still work properly...but you're not worried about that. You're worried about the maximum it can take and not have damage occur. There's a difference. You can either use a TVS diode that clamp in reverse-breakdown or "regular" sufficiently fast diodes that clamp in forward bias to clamp the voltage to the rail supply (but this requires a rail supply to be present). | |
| Mar 27, 2019 at 22:40 | review | First posts | |||
| Mar 27, 2019 at 23:09 | |||||
| Mar 27, 2019 at 22:38 | history | asked | Geoff | CC BY-SA 4.0 |