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Spur Problem in a PLL Circuit – Circuit Schematic
Spur Problem in a PLL Circuit
Hello friends I have a problem in a PLL. I have used a loop filter as shown in this figure: But the output spectrum is as shown in this figure: What`s .....
TEA5767 FM Radio Module C51 AVR Schematic for Philips – Circuit Schematic
TEA5767 FM Radio Module C51 AVR Schematic for Philips
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Television Training Institute 1943 Receiver – Circuit Schematic
Television Training Institute 1943 Receiver
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Philadelphia Wireless Training Institute 1947 Receiver – Circuit Schematic
Philadelphia Wireless Training Institute 1947 Receiver
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KA22427 1 Chip Af/fm Reception Circuit – Circuit Schematic
KA22427 1 Chip Af/fm Reception Circuit
UTC KA22427 is a one-chip AM/FM radio integrated circuit that is suitable for portable radio applications. It includes AM amplifier, local OSC, AM mixer, AM/FM ...
TDA7021T Fm Radio Circuit For Mts – Circuit Schematic
TDA7021T Fm Radio Circuit For Mts
The TDA7021T integrated radio Receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms of small dimen...
TDA7010T Fm Radio Circuit – Circuit Schematic
TDA7010T Fm Radio Circuit
The TDA7010T is a monolithic integrated circuit for mono FM portable radios, where a minimum on peripheral components is important (small dimensions and low cos...
MC28332 Single Chip VHF Narrowband FM Transmitter Application Circuit – Circuit Schematic
MC28332 Single Chip VHF Narrowband FM Transmitter Application Circuit
Crystal X1 is fundamental mode, calibrated for parallel resonance with a 32 pF load. The final output frequency is generated by frequency multiplication within ...
The EF50 the tube that helped to win the War – Circuit Schematic
The EF50 the tube that helped to win the War
The history of a pioneering tube that was developed by Philips Research and that was, next to the magnetron, The most important tube from World War II  The ra...
The Bean-Counter AM Transmitter – Circuit Schematic
The Bean-Counter AM Transmitter
The Muntz one-tube design can be considerably improved by adding an audio preamplifier stage. This will give improved sensitivity, and thus give full modulation...
Canine Radio Direction Finder – Circuit Schematic
Canine Radio Direction Finder
The basic idea is that the transmitter sends beeps and you turn the directional antenna until you get maximum signal and that is the direction of the transmitte...
Amplitude Modulation – Circuit Schematic
Amplitude Modulation
This is a functionally complete, four-quadrant, analog multiplier. Four quadrant means that both operands that are multiplied can take any polarity i. e. +/- an...
A receiving converter for 2320 MHz – Circuit Schematic
A receiving converter for 2320 MHz
The preamplifier is very simple. I used a Low Noise integrated circuit manufactured by Hewlett Packard. The device name is MGA86563. It has a Noise Figure of ab...
A 2.3GHz receiver converter for the Yaesu FT817 allmode transceiver – Circuit Schematic
A 2.3GHz receiver converter for the Yaesu FT817 allmode transceiver
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facelift for the 7MHz TRX – Circuit Schematic
facelift for the 7MHz TRX
Had developed the 7 MHz CW TRX for my first trip to the US. The receiver worked very well. (Actually a lot better than here in Europe since they do not have hig...
high-quality 2.3 GHz Amateur Radio Transceiver – Circuit Schematic
high-quality 2.3 GHz Amateur Radio Transceiver
The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX ...
Radio Circuits – Circuit Schematic
Radio Circuits
The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti. Receiver CircuitThe TDA7000 ...
Single-Chip VHF RF Preamp – Circuit Schematic
Single-Chip VHF RF Preamp
A high performance RF amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without any special test equipment. The ...
Shortwave Monitor – Circuit Schematic
Shortwave Monitor
This receiver not only gives a good indication of the myriad of stations on offer in the short-wave band but is also an excellent tool for monitoring the state ...
Crystal Radio RF Amplifier – Circuit Schematic
Crystal Radio RF Amplifier
The circuit below is a simple but effective amplifier which will give surprising performance improvement. This amplifier can exhibit negative resistance for low...