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Posts tagged 1500

Circuit diagram 75 Meter QRP SSB Transceiver

The 75 Meter QRP SSB Transceiver Theory of Operation 6-30-03 In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is […]

Electronic Circuit Diagram TV Vertical Using LA78041, LA78040

Electronic Circuit Diagram TV Vertical Using LA78041, LA78040

Driver LED circuit for Indicator

Driver LED circuit for Indicator using NE555, 4027, 1N4148

car sound generator schematic

car sound generator circuit car sound generator schematic diagram 555 4017 557 car sound generator schematic 555 Here we have an astable oscillator built around 555, which gives an alarm tone of 1.8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While […]

PCB Booster tube and light flow control valves using 12AU7

PCB Booster tube and light flow control valves using 12AU7 A 12AU7-based booster and light overdrive running at 9 volts.  A very fun little circuit that has a minimal parts count and actually generates a good amount of boost and some overdrive. You can even run this one of a 9 volt battery if you […]

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