Vacuum-Tube Valves Circuits

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1300 Mhz Frequency meter with prescaler
Water Level Alarm
Oscilloscope converter
FM adaptor circuit for car stereo
DDR SDRAM and the TM-4
Temperature Logger and Standalone Voltage Logger
Battery Powered Tube Regenerative Receiver
Multifunction Passive 7400 RFID Tag
Hot-air Rework Station
Using C-MOS light emitting diode drive circuit NAND gate pulse