Negative Edge Differential Differential Amplifier LM3900 (CB4039E)

This circuit was found in the 1990 Motorola Linear Databook and can use almost any operational amplifier. The power supply must be symmetrical.

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Frequency Splitter for Loudspeakers (CB784E)
This circuit is indicated for small low power amplifiers allowing the use of a tweeter. The...
ERB RD RE Series and RG Microcomputer Fuses
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