| Electronics > Beginners |
| Need help understanding a schematic |
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| Prithul0218:
I was looking at this schematic of a DC Load that Scullcom Hobby Electronics made. I couldn't figure out why they were using U7C. The OPA277 has fairly low output impedance, enough for an ADC, doesn't it? I am asking it here cause Scullcom Hobby Electronics didnt reply. Thanks. Schematic source: http://www.scullcom.uk/design-build-an-electronic-dc-load-part-1/ |
| anishkgt:
He may have explained it in his video. Www.Georgehobby.wordpress.com Equipments: DSO104z, Hakko FX888D, Brymen BM869s Sent from my iPhone using Tapatalk |
| Prithul0218:
I went through all the videos. I don't remember that. |
| Zero999:
--- Quote from: Prithul0218 on February 04, 2019, 07:09:59 am ---I was looking at this schematic of a DC Load that Scullcom Hobby Electronics made. I couldn't figure out why they were using U7C. The OPA277 has fairly low output impedance, enough for an ADC, doesn't it? I am asking it here cause Scullcom Hobby Electronics didnt reply. Thanks. Schematic source: http://www.scullcom.uk/design-build-an-electronic-dc-load-part-1/ --- End quote --- It's just a way to use a spare op-amp in a quad package. It could be removed but then the spare op-amp would need to be configured as a unity gain buffer, with its input tied to 0V. If you're using separate op-amps, rather than the quad AD9630, then remove U7C and R11. |
| mvs:
--- Quote from: Prithul0218 on February 04, 2019, 07:09:59 am ---The OPA277 has fairly low output impedance, enough for an ADC, doesn't it? --- End quote --- More then enough to burn something downstream... I would put a resistor to limit current if the output goes negative (Vee is -5V). MCP3426 has diode clamps with 2mA abs. max rating, for AD8630 i have not found any data. |
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