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lennybogzy
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I need to drive some switches which require 28V and sink about 200ma of current. What's my cheapest option? build something or buy some dac?
Bob S said:You could use npn open collector transistors with a Vceo rating > 30 volts (reverse diode protected) and a current rating of >500 milliamps. 2N2222A (MPS2222A) will work, or TIP120 (Darlington) in TO-220 pkg. You can drive these with any 5-volt voltage source.
Bob S
Building computer-driven relays allows for customization and flexibility in design. It also allows for cost savings by only paying for the specific components needed.
The main drawback of building computer-driven relays is the time and effort required for research, design, and assembly. It also requires a certain level of technical expertise and access to necessary resources.
The main factors to consider are cost, customization needs, available resources and expertise, and time constraints. It is also important to assess the complexity of the project and the level of precision needed in the design.
Some common components needed for building computer-driven relays include a microcontroller, relays, sensors, power supply, and programming software. The specific components needed may vary depending on the project requirements.
Yes, there are various resources and guides available online for building computer-driven relays. These include tutorials, forums, and open-source projects that provide step-by-step instructions and code examples for building different types of computer-driven relays.