All sorts of circuits and ideas collected over the years, including some personal designs retained here as a record..
2020 - Four Channel Solar Lights | |
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This circuit implements a four channel solar powered lighting system as an alternative power source in parallel with a 240 supply system. Four Channel Solar Lights Circuit Diagram |
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1978 - Reverse RIAA Plug Box | |
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This circuit implements a passive reverse RIAA filter and is useful for testing phono preamplifiers. The expected and measured frequency responses are included on the diagram. Reverse RIAA Plug Box Circuit Diagram |
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1978 - Balanced transformerless pre-amp | |
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This preamp mimics the output characteristics of a transformer isolated output by maintaining gain when one of the outputs is grounded. The version 2 circuit includes an additional op-amp to buffer and isolate the gain control feedback loop. Balanced transformerless pre-amp Circuit Diagram Balanced transformerless pre-amp v2 Circuit Diagram |
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1977 - 6-bit Delta coder | |
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This circuit implements a 6-bit Delta coder that converts an analogue (audio) input into a 6-bit digital code that tracks the movement of the analogue signal. 6-bit Delta coder Circuit Diagram |
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1971 - Multi-switch light circuits | |
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These circuits show how to wire 2, 3 or more switches to control a single light. Two switch circuits are typically used to provide a switch at either end of a hallway. Three or more switches are typically used to provide a switch at each entrance of a large room or hall. Multi Switch Lights Circuit Diagram Multi Switch Lights Circuit Diagram (PDF) |
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