This amplified speaker is from a Radio Electronics from September 1988. The power integrated circuit is from that time and the other components are still common today.
This circuit is for transducers (headphones or speakers) of 200 to 300 ohms. The frequency is...
This circuit for analog video signals was found in a March 1988 Radio Electronics. The Maxim...
Found in a 1977 publication this circuit is relayed from a signal carrier in a receiver....