I think you should make the LT and the BI inputs of the 4511 to Vcc.
On cmos IC's one should never leave input pins floating, they need to be tied high or low. The LT when is low all segments are turned on. Leaving it floating is probably the problem.
Also no need to have the resistor from the output of the 555 to ground.
The 10pF capacitor on the control should be changed to about 0.1uF.
I think you should make the LT and the BI inputs of the 4511 to Vcc.
On cmos IC's one should never leave input pins floating, they need to be tied high or low. The LT when is low all segments are turned on. Leaving it floating is probably the problem.
Also no need to have the resistor from the output of the 555 to ground.
The 10pF capacitor on the control should be changed to about 0.1uF.
Two supply voltages without any logic level conversion?
With a 10V supply, the TTL counter might release some of its majic smoke.
With a proper 5V supply for the TTL counter then its logic high voltage won't be high enough for some Cmos 4011 and 4511 ICs.
Use a Cmos counter.
Two supply voltages without any logic level conversion?
With a 10V supply, the TTL counter might release some of its majic smoke.
With a proper 5V supply for the TTL counter then its logic high voltage won't be high enough for some Cmos 4011 and 4511 ICs.
Use a Cmos counter and the same supply voltage for the ICs.