Lets say i have a capacitance/resistance controlled oscillator. I want to add a frequency option control panel from which a frequency is selected, using push buttons for example.
I'm not using a variable capacitor/resistor, I will hard-wire a fixed array of both Cs and Rs.
First question, I'm not going to use a mechanical relay to elect the desired capacitor, so my options here are semiconductor switching devices. However as I'm reading about transistors they let current flow so they are not really isolated from the main circuit. Is there any other equivalent to mechanical relays?
Second question, what circuit element should I use for push-buttons, like the ones in a calculator?
Help appreciated.
I'm not using a variable capacitor/resistor, I will hard-wire a fixed array of both Cs and Rs.
First question, I'm not going to use a mechanical relay to elect the desired capacitor, so my options here are semiconductor switching devices. However as I'm reading about transistors they let current flow so they are not really isolated from the main circuit. Is there any other equivalent to mechanical relays?
Second question, what circuit element should I use for push-buttons, like the ones in a calculator?
Help appreciated.
