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
| 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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