Discussion Overview
The discussion revolves around the conversion of Ukrainian transistor designations (KT835, KT827, KT315) to American equivalents for a device schematic that is reportedly over 50 years old. Participants explore potential replacements for these transistors and discuss the overall design and functionality of the circuit, which appears to be a simple inverter.
Discussion Character
- Technical explanation
- Debate/contested
- Exploratory
Main Points Raised
- One participant seeks help in finding American equivalents for the Ukrainian transistors KT835, KT827, and KT315.
- Another participant provides a link to a datasheet for the KT835, but the original poster expresses difficulty in using the information.
- Suggestions for replacements include using BC337 for KT315, BD139 for KT835, and a general power transistor for KT827, although specific recommendations vary.
- There is a proposal to replace multiple components with a single n-channel MOSFET for efficiency and reliability, with a specific part suggested (IRL2703).
- Discussion about the age of the schematic and its relevance, with some participants noting that modern components are generally compatible.
- Clarifications about the circuit's function, with some participants suggesting it is a simple inverter and discussing transformer configurations (L1, L2, L3).
- One participant mentions the importance of current-gain for the power transistor replacement and suggests TIP3055 as a possible option.
- There are questions about the correct wiring for MOSFET replacements and the potential need for additional resistors to simulate base current.
- Participants express uncertainty about the exact function of the circuit and the specifications of the transformer components.
Areas of Agreement / Disagreement
Participants generally agree that the transistors are outdated and that replacements are necessary, but there is no consensus on the best alternatives or the exact nature of the circuit's function. Multiple competing views on replacement components and circuit design remain unresolved.
Contextual Notes
Participants note that the schematic is quite old, and there may be discrepancies in component specifications. The discussion includes various assumptions about the circuit's operation and the characteristics of the suggested replacements.