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To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 buttons S5 S8 are pushed the relay doesn't tension (doesn't receive supply voltage). The supply voltage must be equal to...
The interval between rings can be adjusted by changing the value of the 1 Meg resistor. A 70 volt, 30 Hz ringing voltage is generated from the 120 volt side of a small 12.6 VAC power transformer (Radio Shack...
This schematic illustrates a highly sensitive microphone preamplifier circuit designed to amplify the gain of a microphone or enhance audio signals originating from a microphone. The circuit is straightforward, comprising only a few components, and can be assembled in...
This power supply utilizes a single 7812 IC voltage regulator along with multiple external pass transistors, enabling it to deliver output load currents of up to 30 amps. The circuit design incorporates a 7812 linear voltage regulator, which is...
The amplifier drives a pair of loudspeakers using two LM3876 integrated power amp ICs (50 watts per channel), or a pair of headphones via a Meier crossfeed filter and an OPA2134 dual opamp. It provides four switchable line level...
The call is made using the ISD1016 language chip for voice generation instead of a traditional phone ringing message controller schematic circuit. This controller can store messages, music, songs, or other sounds, serving as an alternative to monotonous ringing. The...
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