i managed to make the BjT version a bit more robust . . . but it still is very sensitive to the Vs
but it's always possible to put the timing chain under regulated voltage . . . the BjT circuits work down to 680mV and even 420mV Vs , they work much better (faster) above 1.26V Vs , even more better above 1.53V and a lot of better above 1.66V -- the simple discrete Op Amp and it's common mode (also bipolar SCS Latches) start working above 1.86V (BE drop 650mV + complementary CE drop 380mV ... leaves some 830mV (45%) on biasing resistors) and start working better above 2.16V Vs (BE drop 650mV + complementary CE drop 380mV ... leaves some 1.13V (52%) on biasing resistors) ← so using the simple TL431 (1.6 ... 2.8 V) shunting regulator is a fastest good option . . .
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▼ the functionality (similar to the figure below) can also be achieved by using a basic two transistor Flip Flop + 1 more DTL based ...
? AND OR NAND NOR ? -- depending on polarity and optimum configuration ... LED-amp (Fig.3) -- where 1 input serves as 10s timer
e.g. -- a similar to the below but with 3 transistors
View attachment 197109
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so much about the 3 transistor v. (← it can be done . . . perhaps done better with the MosFET timer -- but will not be too practical)
View attachment 197136

You most certainly can’t do simple circuits . Thanks Does the 555 timer circuit work in exactly the same way as the flip flop, as component wise it is a huge cut down? Not fussed about voltage drift for this as is only for one LED. Thanks so much for putting a lot of effort in to all the schematics!

 

The NE555 is purportedly the "Most Used" IC ever made. Take a gander at it's PDF. It does contain a Flip-Flop in it's circuitry. Worth the time to at least know what it is and play with to understand what it can do. In both the Astable and Monostable modes.

 

i just wanted to make it more clear to myself . . .
the voltage independent oscillators other than 555 ::
LM358 versus 74HC04

↓ opAmp variant ↓ of the Mosfet oscillator (Fig.3 & 4) -- the vice versa (for Fig.1 & 2) is possible by slowing the 74x04 output down by R C "integrator"/damper -- but the component count is likely unreasonably high . . .

 

A 555 is quite simple, being basically a level-triggered flip-flop.

When the TRIG voltage goes below 1/3 Vcc, the FF is set (OUT high and DIS open).
It stays high as long as the TRIG voltage stays below that voltage.
That's why an external TRIG input must be low no longer than the shortest high period of the 555 output.

When the THRS voltage goes above 2/3 Vcc, the FF is reset (OUT low, and DIS connected to ground).
It stays low as long as the THRS voltage stays above that voltage.

Using that, you should be able to understand the operation of all the various configurations for the 555 (one-shot or monostable, astable, PWM oscillator, etc.)

 

View attachment 196991
I think I will base the electronics off of this simple circuit, do you think it will work?

If that 10uf cap backwards? Looks like it.