5

I guess the 1us RC lowpass filtering tries to keep off false keyhits caused by phones and other radio transmitters. The debouncing is performed with software. Do not add slowness to the circuit which detects if a key is pressed. Players hate delays. There's enough it already (MIDI transmission,communication between the MIDI interface and the computer ...


3

Just use any number of DPDT switches in between : ) For example, with three switches like simulate this circuit – Schematic created using CircuitLab and four switches like simulate this circuit And so forth and so forth! Here's an example for five switches: simulate this circuit


2

Digikey has a good search engine with filters electromechanical>switches>Rocker> illuminated > Ctrl+ select after sort by illumination colour, Choose in stock only Results e.g.


2

Something like this should work. The standby current draw is less than a microamp. Depending on the battery size, the battery might last almost as long as without a load. "Jonk" loves these kinds of problems, he will likely have something better. simulate this circuit – Schematic created using CircuitLab


1

simulate this circuit – Schematic created using CircuitLab Figure 1. (a) Typical 2-way switching as used on stairways. (b) OR switching. If you want either room to be able to switch on or off then use (a). If you want the heater to be on if either or both rooms require it then use (b). If you want to switch the input to the digital system then: ...


1

This is a bit of a creepy circuit. It appears to work on the relay hysteresis. So the relay coil, in series with a diode D2 and the 100\$\Omega\$ resistor, receives enough current to hold the relay in, but not to actuate it. Full voltage is applied to the relay when TP1 is bridged, so it pulls in. When TP2 is bridged, the 100\$\Omega\$ resistor receives ...


1

If you are able to convert this 10V/1mA (1) to a bit more mA @ 1V or 2V you may want to consider using a "photovoltaic relay" or "solid state mosfet relay": where pins 3 and 4 are the isolated terminals A and B. You should check the maximum required "trigger forward current" or "the minimum control current" or whatever description that tells you which ...


1

You need the transistor to be a saturated switch. The datasheet for your transistor and nearly every other transistor shows that its base current should be 1/10th its collector current for it to saturate well. Then the base current must be 300mA/10= 30mA. Can the ESP01 output 30mA at a reasonable voltage? The saturation voltage loss is shown as a max of 0....


1

Let me address a couple things as a pilot... Why? Well, for example, if the pressure switch in the gear up part of the circuit should fail, I can still get the gear to retract by activating the override push button. This is a big no-no as a pilot. The last thing you want to do is to bypass something that is failing. If your gear doesn't retract, leave it ...


1

I traced the output section of your RADAR module from the product photo. It appears to look like this:- simulate this circuit – Schematic created using CircuitLab The BISS0001 is designed for use in PIR motion detectors, and performs a similar function in the RADAR detector. When a signal is detected pin 12 goes high, turning on Q3 through R11. This ...


1

The transistor and resistors are okay for a buzzer that draws a moderate amount of current, 100 or 150mA is fine (forced beta of 10-20). If the buzzer is an electromagnetic type, it should have a catch diode across it. Eg. 1N4148. Reverse biased, of course. You should have separate resistors for each LED. There should be high value pullup resistors (eg....


1

Infinite switches are not thermostatic controls. They regulate the percent of time the controlled heating element is on. All infinite switches use a nichrome heater wire or ribbon and a bimetal strip to open and close the electrical connection to the heating element being controlled. The shaft of the control has an eccentric that varies pressure on the ...


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