This is the circuit diagram of 35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked…
This is the scheme diagram of automatic 9V battery charger circuit, the parts list provided below the schematic image. The…
This is the circuit diagram of emergency light included the alarm circuit to show you that there is no power…
Here the 35W power audio amplifier circuit based on LM391. Inductor L1 is constituted by 20 coils of wire, with…
Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and…
This motion filter effect circuit will controls the initial frequency and controls how much the envelope follower responds to the…
This is the LED pilot light (or LED indicator) circuit. LEDs (Light Emitting Diode) part are interesting things. They only…
This is a A/B Box switch pedal schematic with two inputs and one output and featured with dual operational amplifier…
This document is the manual of 2x90W Stereo Tube Power Amplifier with EL34, model K4040 by Velleman. The document in…
This is the digital fan speed control circuit design that can be utilize to control the speed of 220V fans…