I want to build this cricket chirping circuit that I found on Happy Lab.
The values are specified as follows
R1: 100 k R2: 39 k R3: 290 k C1: 100 nf C2: 10 µf C3: 10 µf C4: 100 µF D1,D2: 1N4148 IC: 74HC14 (6x inverter with Schmitt trigger)
I have sourced all the parts except am having trouble getting 10uF ceramic capacitors for C2 and C3 in time for my deadline. Happy Lab application notes say
Since the use of polarized capacitors for C2 and C3 is kind of unskilled (it works most the times especially when using higher voltage capacitors ie. 63 volts) it is better to use non-polarized capacitors. 10µF non-polarized ones are expensive and or bigger. So much smaller capacitors can be used when increasing the value of the corresponding resistor at the same time.
I don't follow this. Does this mean I can use 16V 10uF electrolytics (which I do have) for C2 and C3? I am aware electrolytics can explode with reverse polarity which obviously would be bad.
If I can use the electrolytics, which side of C1 is +ve? The trigger output or diode facing side? My analogue circuitry is very rusty.
I plan to drive this circuit not with a solar panel but 2 x AA's in series (3V).