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This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. Timing is provided by R1,R2 & C1. To change flashing frequency don’t modify R1 and R2 values: set C1 value from 100 to 2200uF instead.
This Audio amplifier has output 18 Watt RMS into 8 Ohm (1KHz sine wave) and Frequency response 30Hz to 20KHz -1dB. It’s simple to build and you don’t need preamplifier. Few notes about this circuit.
Do not exceed 23 + 23V supply.
Can be directly connected to CD players, tuners and tape recorders.
D1 must be in thermal [...]
Protection in electronic circuits is crusial factor. especially polarity reverse protection. Can you imagine what happen if our circuit not pretected to reverse polarity supply. All digital IC will be damage, and also electrolit capacitor will blow up. via circuit electronic
This is may be the simplest radio transmitter that you will find anywhere. lt has a total of fiye parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission is useful. via electronic circuit