Broadcast Band Rf Amplifier Circuit
The circuit has a frequency response that ranges from 100 Hz to 3 MHz; the gain is about 30 dB. Field-effect transistor Ql is configured in the common-source s...
Gasfet Preamp For 435Mhz Circuit
This circuit is a low-noise preamplifier for the 435-MHz amateur satellite frequencies. The circuit uses a Mitsubishi MGF1302. A 28-Vdc source is shown,...
Vhf-Uhf Preamp Circuit
The MAR-x preamp shown will cover up to 1.5 or 2 GHz with the correct MAR-x IC. ATTN1 should be omitted for low noise-figure.appli cations. ATTN1 and ATTN2 pro...
Ne602 Superhet Front End Circuit
By using an NE602 with a filter and an MC1350P IC, a front end and an IF system for a basic superheterodyne receiver can be built with few parts....
Transistorized Am Radio Circuit
Shown is a schematic of a typical transistor AM radio. This circuit uses npn transistors. The circuit is generic; therefore, no specific values are given for s...
Super-Simple Shortwave Receiver Circuit
Integrated circuit Ul (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at Jl) are fed through ...
80M And 40M Cw-Ssb Receiver Circuit
This direct-conversion receiver uses a TDA7000 IC and it drives an LM386 audio amplifier. The TDA7000 is used for its mixer and L.O. section. ...
Ne602 Direct Conversion Receiver Circuit
An NEC602 is used as a mixer with a zero IF frequency output, U2 acts as an audio amplifier. This receiver is primarily for SSB and CW signals. Tl and T2 are 1...
Vlf Whistler Receiver Circuit
The VLF whistler receiver is intended to listen to natural radio noise and signals that occur below 20 kHz. LI is a large loop antenna that is 250 to 300 turns...
27.145Mhz Nbfm Receiver Circuit
Using a Motorola MC3363 LSI one-chip FM receiver, the circuit is a dual-conversion FM receiver with a 10.7-MHz IF chain....
Conversion Receiver For 160 To 20M Circuit
Note that Tl and T2 are TOKO, including part numbers for the coils Tl and T2. The direct-con-version receiver shown uses a double-tuned input network made from...
Simple Spectrum Analyzer Adaptor For Scopes Circuit
Suitable for monitoring an amateur band or a segment of the radio spectrum, this simple adaptor uses an NE602 mixer-oscillator chip to produce a 455-kHz IF sig...
Adjustable Vfo Temperature Compensator Circuit
Use of a differential capacitor allows temperature compensation of LC circuit using an NFO and N1500 ceramic. C6 is a differential capacitor that has two stato...
Local Oscillator For Double Balanced Mixers Circuit
This circuit has an amplifier to supply +10 dBm to an SBL series (Mini-circuits) or similar type doubly-balanced mixer assembly. This circuit has values shown ...
Mosfet Mixer-Oscillator Circuit For Am Receivers Circuit
This circuit is an improved front end for upgrading a transistor AM receiver. This front end is useful ...
Simple Noise Limiter For Receivers Circuit
This circuit uses a diode series clipper to limit noise peaks on a received signal. ...
Fm Modulator Circuit
The FM modulator is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209, are used to frequency modulate the oscillator. The 5000- potentio...
Preamp Transmit-Receive Sequencer Circuit
This circuit is useful in amateur radio VHF and UHF work where a mast-mounted antenna preamp is used for receiving. The kit controls T-R switching and change-o...
Hum Reducer For Direct-Conversion Receivers Circuit
One cure for ac power line hum and ripple (caused by leakage current) is to use a well-reg-ulated and filtered 9- to 18-Vdc power supply with a balancing choke...
50Mhz Rf Bridge Circuit
The bridge shown was used for measurements on 50-MHz amateur radio antennas. Rl is a miniature 500 linear potentiometer....