Portable AM Receiver Using ZN414 Integrated Circuit

The circuit exemplifies the use of ZN414 IC to produce a handy AM radio receiver.

Amplitude Modulation Receiver Circuit

The circuit was designed to be able to obtain signals via amplitude modulation where the sensitivity and selectivity is fairly good.

Whip Antenna Operating At Medium Wave Frequency

Designing the circuit for this antenna to be telescopic makes it collapsible where it can be extended to its full length or retracted to a small length for storage portability. It may consist of a series of small diameter tubes of 6 to 8 inches in length nested one inside the other.

Voice Transmitter via Frequency Modulation

The circuit is designed to establish a voice transmitter by means of frequency modulation band.

88-108 MHz VHF FM Band Preamplifier by 2N3819 FETs

This circuit is a VHF (Very High Frequency) preamplifier for the band two spectrum tuning approx. 88 - 108 MHz.

High Power FM Wireless Microphone

This one is a high power FM wireless microphone that provides very good frequency stability in about 1km range and very good microphone sensitivity. It can be used inside guitars, as a part of remote control systems or in other similar applications.