Mutchus

Simple Advance Burglar alarm from dual-op amp Circuit . Device such as burglar alarms and sirens, whose basic purpose is to monitor certain conditions, make enjoyable projects because of the verity of sounds they can generate. Figure 1 shows a simple siren/alarm circuit using a dual-amp MC1458, audio amplifier LM380, and a 1-W speaker. The dual op-amp is used as a signal generator that produces square, pulse and triangular or sawtooth wave froms. The operation of the circuit is as follows. The A1 and A2 op-amps make up a waveform generator in which the output of A1 is a square wave or pulse waveform and that of A2 is either a triangular or sawtooth waveform.  The potentiometer R2 controls the frequency as well as the type of output waveform of op-amps A1 and A2. The switch SW1 connect the output of A1 or A2 to the audio power amplifier LM380, this in turn drives the speaker. Although not used in the circuit of figure 1, a potentiometer may be connected between (+) and (-) inputs o...

It’s a trying task to find something for your lovable computer geek significant other. Especially when they say they want something shiny and outlandishly expensive. Luckily, there is the World’s Most Expensive Computer Mouse. Yes, that is the mouse’s literal product name. Having looked at the price, the product name is definitely right on the money. The mouse is advertised as the perfect 60th wedding anniversary gift since traditionally speaking that anniversary calls for a diamond. It also works for the 50th, since that one is gold. These computer accessories come in yellow, red or white gold with black or white trim. You can design your own or pick up the Diamond Flower or Scattered Diamond designs. To purchase your very own it’ll cost you £16,200.00 or $26,730, but hey, diamonds are forever. Of course it only takes a month for gadgets to become outdated, but at least the shiny stuff is forever. Source: Technabob

Low pass filter is a circuit to filter freq dirty from an fm transmitter. so we get a clean signal. and can maximize the output power generated from the booster. low pass filter is capable to 150 watts. in this post . file [lay] that can only be opened with software sprint layout. for those interested please download here.