T&L Publications

Consider the following Common Collector & Darlington emitter follower circuits, CASE 1: Let V(in) = 5V Vcc(supply) = 10V Emitter(load) resistance = 100 ohm thus, V(out) should be 5V (following input) Corresponding Load current will be 5/100 = 50 mA CASE 2: Let V(in) = 5V Vcc(supply) = 10V Emitte...

But what does the "minimum period of 625ms" mean? Steve G Normally the Differentiator is designed for a periodic pulse input with specific period T. But in the above application scenario the differentiator is being fed by a single pulse through push switch. So there is no specific T as of...

I used to carry a large amount of following items from one place to other by bus. 1. Capacitors-5 types-Total 380 nos 2. Connectors-14 types-total 40 nos 3. Diodes-3 types-200 nos 4. CMOS ICs-3 types-6 nos 5. DIP ICs-5 types-66 nos 6. TO 99 ICs-2 types-6 nos 7. OP AMPs-1 type-2 nos 8. FPGAs-2 type-4...

Now I'm really confused! :/ I don't know where you got this "RC<0.0016T" The time constant is R times C or 10K x .1uf , which = .001 second or 1 ms. What do you mean by the " Differentiator as signal conditioner is designed for minimum period of 625ms"? Steve G pulse differentia...

sghioto wrote:I think you meant 625 us in the description of the differentiator circuit.

Steve G

RC<0.0016T
R= 10K
C=0.1UF
So, T= 625mS

optimized schematic to overcome above mentioned difficulties..

AC coupling by using differentiator

The following are the difficulties I have faced during the above circuit implementation, 1. 1ms pulse by pressing the trigger micro switch is hard to achieve as it depends on the duration of pressing the switch and is beyond 1ms (depends on the operating person) 2. To overcome the above difficulty I...

What would be the output of 555 1 second monoshot if I press the triggering push switch for 5 second ?

555-OPAMP-BJT
Here is 555 oneshot with LM324 & 2N2222 for 0-5V continuous amplitude variation of 1ms pulse.

Any rectifications ?

Looks good to me. Steve G But as per one of my friends opinion... " The circuit does not produce accurate voltages. The output voltages change when the load current changes and they change when the temperature changes. The voltage even changes as the output transistor warms up. The output high...

Pls find the modified schematic.....Is it OK ?

Can I produce the low values like 0, 0.5, 1.0 V by turning 5K ? (also 1.5, 2.0, 2.5, 3 medium values & 3.5, 4, 4.5, 5V high values at output of darlington)

but this will be a completely variable adjustment not .5 volt steps as stated in your schematic heading! Steve G Don't worry about 0.5V steps, 0-5V continuous variation is required by manual turning of POT and the pulse at load is monitored for amplitudes set at 0,0.5,1,1.5,2,2.5,3,3.5,4,4.5, &...

Does this works !!!!!

Robert Reed wrote:You did not mention pulse requirements.

5V-1ms pulse