FTDI Circuit Schematic

Many amateur receivers are equipped with an S meter that does not operate logarithmically. The proposed circuit is intended to enhance such receivers. Although integrated circuits like the CA3089 or CA3189 are not commonly used today, they play a...

This is an infrared-based broken beam alarm designed to protect doors and entry passages. It emits a loud alarm when someone crosses the invisible infrared barrier. The infrared-based broken beam alarm system operates by utilizing a pair of infrared emitters...

This device is designed to be a simple, inexpensive comparator intended for use in a solar cell power supply setup where a quick indication of "too low" or "just right" voltage is needed. The circuit consists of one 5V...

Vegetable greenhouse temperature detection control circuit. The greenhouse temperature detection control circuit is primarily composed of a temperature sensor SL234M, operational amplifiers LM324 and LM358, a dual time base circuit NE555, a relay, and a display driver circuit. The...

The circuit depicted in Figure 3-134 utilizes an automatic control braking mechanism, which is an enhancement based on the time relay system shown in Figure 3-133 (a). The KT control allows for an adjustable braking time of 2 to...

This unit would be mounted in a small plastic or preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a mic) and a switch. Current drain is low, since the circuit only...