This circuit is design for flash at that rate in perfect synchrony. This circuit is work with based on two transistor NPN. This is the figure of the circuit.
This circuit uses a 4 uF film capacitor but other values will work if the timing resistor is changed in inverse proportion. For example, a 1 uF capacitor would require a resistor about 4 times larger. If you wish to simulate this circuit with a Spice program, connect a 50 or 60 Hz voltage source set to about 100mv, a 100 mega ohm resistor and a 100 pF capacitor all in series between ground and the base of the PNP to simulate the electric field. For "real-world" testing, a period counter is hard to beat but an oscilloscope with line trigger will also do the trick.
This circuit uses a 4 uF film capacitor but other values will work if the timing resistor is changed in inverse proportion. For example, a 1 uF capacitor would require a resistor about 4 times larger. If you wish to simulate this circuit with a Spice program, connect a 50 or 60 Hz voltage source set to about 100mv, a 100 mega ohm resistor and a 100 pF capacitor all in series between ground and the base of the PNP to simulate the electric field. For "real-world" testing, a period counter is hard to beat but an oscilloscope with line trigger will also do the trick.
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