Wiparat Circuit Electronics

The Tri-Waveform Generator can be used for a number of different uses. The one that I use it for is a signal generator to test circuits. The frequency range is 20 to 20khz. and can be adjusted by R1. The duty cycle or the time that the waveform is high and the time that the [...]

Whooper by LM3909
Speaker 8 OHM.
Voltage Supply 1.5V Only.
This origin sound unusual circuit. Be the sound is whooper which this circuit uses IC LM3909. Then use voltage supply 1.5V only just. Can apply to 8ohm loudspeakers. But this work must use IC LM3909 x 2 amounts are, but there is the size of tiny circuit sir.
Source [...]

The LM317T output current can be increased by using an additional power transistor to share a portion of the total current…………….
Read more : LM317T Voltage Regulator with Pass Transistor