1Hz to 16Hz Stable Oscillator Circuit by 4521

Description:

This is the circuit that I use every time when I need very stable 1Hz frequency. Since there isn't too many components and the basic structure of the circuit makes easier to use this oscillator in other circuit designs. The frequencies of the 4521's outputs are shown in the circuit schematic. The 14 numbered pin is used for 1Hz output. You can see the frequencies (1Hz-16Hz) out of the other pins...

LF353 Opamp Square Wave Oscillator with Adjustable Frequency

Description: 

This oscillator circuit is designed by LF353 Op-Amp. The square output wave frequency can be adjusted by using the 10K potentiometer. The required supply for the circuit is 10V. By using two resistors, you can make a voltage divider and apply the ±5V values to the amplifier.

30W MosFet Audio Amplifier IRF530-IRF9530

Description: 

This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality.

The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with <0.08% THD @ 1KHz at the onset of clipping (0.04% @ 1W - 1KHz and 0.02% @ 1W - 10KHz) and up to 30W into a 4 Ohm load.