Finally after almost a month of waiting for it my XR 2206 has arrived.
I went to test it on a breadboard.
I connected everything as on the circuit in figure 11 in the datasheet, with the minor difference that the pot at R1 is 1MΩ instead of 2MΩ.
I pre-setted both pots in the circuit to max values.
I checked all connections with an ohm meter.
I double checked connections on the breadboard and in the diagram in the
figure 11.
I chose a low test voltage (12V) close to the minimum specified in the datasheet.
I hooked the output to the scope over a 1/10 probe.
I placed my finger on the IC (first hand temp control ) and turned on the power supply.
Nothing happened, no sings of life at all (i checked all time basses and amplitudes).
Than i tried to see what happens if i move the pot at R3 (for setting ramp/sine, btw i need sine output).
Nothing happens over the entire range of the pot, still completely dead.
I returned R3 pot to its starting position and tried moving the R1 pot (for freq adjust).
Nothing happens, but when the pot reaches about half of its range (~500kΩ) the IC suddenly gets vary hot, so hot i cant keep my finger on it anymore.
Than immediately turned of the power supply.
I triple checked all the connections on the board and on the diagram. No mistake there, at least none i can see.
But result is always the same, the IC heats up fast and plenty when the pot at R1 reaches about half of its value.
WHAT IS GOING ON ?
P.S.
The IC and the datasheet are from the same company.
I went to test it on a breadboard.
I connected everything as on the circuit in figure 11 in the datasheet, with the minor difference that the pot at R1 is 1MΩ instead of 2MΩ.
I pre-setted both pots in the circuit to max values.
I checked all connections with an ohm meter.
I double checked connections on the breadboard and in the diagram in the
figure 11.
I chose a low test voltage (12V) close to the minimum specified in the datasheet.
I hooked the output to the scope over a 1/10 probe.
I placed my finger on the IC (first hand temp control ) and turned on the power supply.
Nothing happened, no sings of life at all (i checked all time basses and amplitudes).
Than i tried to see what happens if i move the pot at R3 (for setting ramp/sine, btw i need sine output).
Nothing happens over the entire range of the pot, still completely dead.
I returned R3 pot to its starting position and tried moving the R1 pot (for freq adjust).
Nothing happens, but when the pot reaches about half of its range (~500kΩ) the IC suddenly gets vary hot, so hot i cant keep my finger on it anymore.
Than immediately turned of the power supply.
I triple checked all the connections on the board and on the diagram. No mistake there, at least none i can see.
But result is always the same, the IC heats up fast and plenty when the pot at R1 reaches about half of its value.
WHAT IS GOING ON ?
P.S.
The IC and the datasheet are from the same company.