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STD AF7KR Step Attenuator
License: CC-BY 3.0
Mode: Editors' pick
- 3
Update time：
2021-12-16 22:05:37
Creation time：
2019-08-20 20:55:19
Description
Poor ham's step attenuator using 0.1" jumpers as switches.
I glued together 2 jumpers with superglue.
Resistor values are from E24 5% row.
Update 10-14-2019: Built 3 boards. There is no significant feedthrough up to 2GHz. Attenuation flatness is ok up to about 400-500MHz, then inductance of the "loops" formed by the jumpers and resistors causes significant excess attenuation.
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | CONREVSMA009 | J1,J2 | CON-SMA-EDGE | 2 |
| 2 | Header-Male-2.54_2x2 | P1,P2,P3,P4,P5,P6,P7,P8 | HDR-TH_4PIN-V-ROW2-COL2-MALE-PITCH2.54 | 8 |
| 3 | 62 | R1,R3,R4,R6,R7,R9 | 1206 | 6 |
| 4 | 240 | R2,R5,R8 | 1206 | 3 |
| 5 | 100 | R10,R12,R13,R15 | 1206 | 4 |
| 6 | 68 | R11,R14 | 1206 | 2 |
| 7 | 180 | R16,R18 | 1206 | 2 |
| 8 | 30 | R17 | 1206 | 1 |
| 9 | 300 | R19,R21 | 1206 | 2 |
| 10 | 18 | R20 | 1206 | 1 |
| 11 | 910 | R22,R24 | 1206 | 2 |
| 12 | 5.6 | R23 | 1206 | 1 |
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