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STD Bob Pease's High Impedance Active Scope Probe (PCB Design)

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Update time: 2021-04-09 13:34:50
Creation time: 2014-07-07 13:51:45
Description
This project contains the passive schematic and PCB design for the circuit as simulated in `Bob Pease's High Impedance Active Scope Probe simulations`: https://easyeda.com/guest/Bob_Pease_s_High_Impedance_Active_Scope_Probe_simulations-gsmEyQ8qj This project contains the passive schematic and PCB design for a simple DIY low frequency high input impedance active scope probe adapter. It could also be used with a DVM. The original design can be found in: "Troubleshooting Analog Circuits" by Bob Pease; Part 2 "The right equipment is essential for effective troubleshooting", Section 3, Figure 3. http://www.introni.it/pdf/Bob%20Pease%20Lab%20Notes%20Part%208.pdf
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 mmbfj309lt1 J1,J2 SOT23 2
2 Qmmbt3904lt1 Q1 SOT23 1
3 mmbt3906lt1 Q2 SOT23 1
4 51 R1 R0805 1
5 100 R2 TRIM_BOURNS_3223G 1
6 3.3k R3,R4 R0805 2
7 10Meg RDNF1,RDNF2,RDNF3 R0805 3
8 10n C1,C2 C0805 2
9 SIP3 CON2 HDR1X3 1
10 620 RDAMP1 R0805 1
11 SMA_90_R300.124.403 CON3 SMA_90_R300.124.403 1
12 SIP2 P1 HDR1X2 1
13 47 R5 R0805 1

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