Bootstrapped Sziklai Pair Design

Thought for 16 sec

I’ll build the requested NPN/PNP composite stage by first checking the existing KSC1845 part, then finding/adding the KSA992 and required bias/bootstrap passives, wiring the Sziklai topology, and running an electrical review.

Worked for 2 mins 13 sec

flux

I found the KSA992 library part and confirmed both TO-92 pinouts use 1=Emitter, 2=Collector, 3=Base. I’m treating the existing KSC1845 part pins as the NPN transistor and will add an external VCC/IN/OUT/GND interface plus configurable bias/bootstrap parts.

Worked for 58 sec

flux

I’m blocked from creating the circuit in this project because your current access is comment-only, and schematic edits require edit access.

I did verify the design basis: KSC1845FTA is the NPN device, KSA992FTA is available in the Flux library for the PNP device, and both TO-92 pinouts are 1=Emitter, 2=Collector, 3=Base. The intended topology is:

KSC1845 as the input/emitter-follower driver
KSA992 as the PNP common-emitter output device
Q1 emitter driving Q2 base
Q1 collector and Q2 emitter tied to VCC/composite collector
Q2 collector as OUT
Bias divider plus bootstrap capacitor from OUT to the upper bias node

Give me edit access or fork this part into an editable project, and I can add and wire the full bootstrapped Sziklai pair.

Manual schematic guide

Calculate bias values

Find transistor parts

Document topology

Run review after wiring

Reviews

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