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PLL AM LO – Circuit Schematic
PLL AM LO
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Crystal Set 1 – Circuit Schematic
Crystal Set 1
The P-C70-A from Antique Electronics Supply works just as well and maybe a little better than the coils you can wind. Winding coils is an interesting experiment...
Basics 06 Mod – Circuit Schematic
Basics 06 Mod
The very first form of radio communication was radio telegraphy, as opposed to wired telegraphy. The telegraph key turns the transmitter on when it is closed an...
AA5 6 – Circuit Schematic
AA5 6
The common wiring method had one side of the line cord going to a pin on the rectifier tube and the other side going to one terminal of the on/off switch. The o...
4 Tube Superhet – Circuit Schematic
4 Tube Superhet
The theory of operation has already been covered either in the Simple Superhet or the All American Five. Building this radio is really not hard especially if yo...
active mixer – Circuit Schematic
active mixer
The calculator computes the gain and output impedance of a common plate load mixer. Each input channel controls a separate grid, which affects the plate current...
fm bug – Circuit Schematic
fm bug
A simple little three-transistor FM wireless microphone / room bug that can really throw-out quite a signal. With a wide tuning range from 80 MHz to 120 MHz, th...
radio mf tx – Circuit Schematic
radio mf tx
I`ve had an interest in building a simple VXO transmitter for many years, but was unsure that the limited tuning range usually associated with VXOs would be use...
af filter – Circuit Schematic
af filter
The graphs below show the computer predictions of filter performance forwarded to me by Harry PA0LQ. Click on the thumbnail sketch to show the full-size graph. ...
handy mac jul aug 1963 am – Circuit Schematic
handy mac jul aug 1963 am
When I wax nostalgic about old tube radio sets, it is not because I don`t appreciate the performance and quality of modern electronics.....
uhf tv antenna booster circuit diagram – Circuit Schematic
uhf tv antenna booster circuit diagram
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tv transmitter circuit using lm1889n – Circuit Schematic
tv transmitter circuit using lm1889n
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max2338 hp at the sound amplifier – Circuit Schematic
max2338 hp at the sound amplifier
The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks...
hp max2338 mixer if saw filter match at 183 6mhz for cdma – Circuit Schematic
hp max2338 mixer if saw filter match at 183 6mhz for cdma
183. 6MHz SAW filter in a CDMA application. The SAW filter S-parameter is used to simulate the interface with the mixer. A worked example is provided with a SAW...
swr metering circuit and ssb transceiver 80m 40m boster filter if radio – Circuit Schematic
swr metering circuit and ssb transceiver 80m 40m boster filter if radio
A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LE...
schema radio chip – Circuit Schematic
schema radio chip
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rf preamplifier – Circuit Schematic
rf preamplifier
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rf preamp circuits – Circuit Schematic
rf preamp circuits
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rf amplifier – Circuit Schematic
rf amplifier
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mini fm radio transmitter circuit – Circuit Schematic
mini fm radio transmitter circuit
This small FM transmitter with a range of about 50 meters designed for hoby. With lots of mini-transmitters then you have a comprehensive, action-packed radio p...