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These components (with Commodore's part number 390229) have been pulled out from working machines. While there are some traces of previous soldering, rest assured that no pins are bent or broken. They remain in good condition overall.
1. **Purpose and Usage**:
- The Video Hybrid, also known as VIDIOT, serves as a hybrid integrated circuit acting as a **Digital-to-Analog Converter (DAC)**.
- It converts the digital 4-bit per color video signal from the Amiga computer into standard analog signals suitable for driving a monitor or TV.
- Used in various Amiga models, including A500, A500+, A1000, A2000, and A3000.
- Also found in add-on cards like the Commodore A2320 Flicker Fixer and maybe other ones with same features.
2. **Architecture**:
- The Video Hybrid consists of five sections:
- Red, green, and blue color sections: These sections mix digital signals using binary-weighted resistors DAC configuration.
- Amplification: The resulting signal is amplified through an NPN transistor and terminated at 75 ohms (typical for video signals).
- Composite monochrome signal: Generated similarly with different resistor values and a two-stage amplifier (NPN + PNP) for higher gain.
- Synchronization signal: Digital by nature, requiring no conversion, only amplification.
3. **Component Details**:
- The Video Hybrid primarily comprises resistors, transistors, and capacitors.
- Original Video Hybrid uses resistance values that are now uncommon and expensive.
- Different resistor values were used in various revisions (e.g., revision 3 with higher resistance for synchronization signal to reduce crosstalk).
Note: Rev. 03/E (latest) components are better than 01/A ones.
Remember that if the Video Hybrid gets damaged, replacement is the only option since repair isn't feasible. If you have any more questions or need further assistance, feel free to ask! 😊
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Facebook Page: Amigatronic
You can also find us on popular platforms like
Tindie, Lectronz and Sell My Retro
Orders processed around 24hs from payment, including holidays