- DDS RF Signal Generator
Frequency range: 50 Hz to over 70 MHz - Valve Preamplifier (2)
construction - Xilinx PROM Programmer
Parallel port serial PROM burner - Valve headphone Amplifier
EL84 (6BQ5) at an anode voltage of 40 V - The P89LPC900 (1)
the architecture - TinyLogic Ics Type NC7SZ57/58
Configurable logic gates - Precision Measurement Central (3)
Flash for all purposes - SuperCap Battery
Power from a GoldCap - DC-Operated Stepper Motors
With unidirectional rotation and slow speed - R-C Network Measurement with BASCOM AVR
Better accuracy from a new command - Minimalist Induction-Balance Metal Detector
A low-cost treasure hunter - Valves at Low Voltages (2)
more power! - Headphone Amplifiers
DIY with valves and semiconductors
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